Hi Bryce720,
Welcome to the Mattress Forum! … and I’m glad the information here has been helpful. 
Assuming that the materials in a mattress you are considering are durable enough for your body type and meet the quality/durability guidelines here relative to your weight range … the choice between different types and combinations of materials and components or different types of mattresses are more of a preference and a budget choice than a “better/worse” choice (see this article).
Each person is unique and can have very different preferences. While it’s certainly a very high quality and durable materials, like all materials … some people love latex and some people don’t like it nearly as much. When you spend some time testing mattresses it’s not unusual at all that what you “want to like” based on what you’ve read can be very different from what you actually like in “real life”.
You can read a little more about the Dunlopillo Ambiance in this topic and I would be very cautious with any mattress that has more than “about an inch or so” of lower quality and less durable materials or “unknown quality/density” materials in the upper layers of the mattress that would likely be a weak link in the mattress in terms of durability. A forum search on “Ambiance” will also bring up more comments and feedback about it as well.
Vi-Spring is certainly an exceptionally high quality hand built and tufted mattress that uses high quality materials and components (pocket coils and natural fibers) but as you probably know it’s in a much more premium budget range than many other mattresses that also use natural materials. There is more about Vi Spring and other “ultra premium” mattresses in post #2 here and post #2 here and post #2 here may also be of interest as well but I would be very careful to differentiate how you feel “about” a Vi Spring and how you feel “on” a Vi Spring. There are certainly cases where a mattress in this budget range may be “worth it” for a particular person that isn’t price sensitive and that has specific criteria that aren’t available in lower budget ranges but this would be unusual and in general I would need a compelling reason that clearly indicated there was “enough” of a difference in “real life” compared to many other mattresses that may be just as suitable in terms of comfort and PPP (Posture and alignment, Pressure relief, and your Personal preferences), just as durable, and that are in much lower budget ranges to justify the higher cost.
[quote]The sales guy said try this “Spink in Edgar” it felt just like the ViSpring. To be honest I could tell no difference?? The model we looked at was the Angora 9000
Natural and Chemical Free Fire Barrier
3 All natural filling material pads of Angora, Alpaca, Yorkshire Wool, Egyptian cotton, hemp and flax
4 Layers of HD micro coils (8,320)
7’’ Comfort Core Innerspring with Quantum Edge Perimeter (1,076)
1 All natural hemp insulator pad
Total coil count: 9,396 coils
20 Year Non-Prorated Warranty[/quote]
While I can’t speak to how any mattress will feel for someone else or whether it would be a good “match” in terms of comfort, firmness, and PPP … the natural fibers and the microcoils and the Comfort Core pocket coils are all good quality materials and there are no lower quality materials or weak links that would compromise the durability or useful life of the mattress. There is more about microcoils that are used in comfort layers in this article and in post #8 here and post #2 here.
The basic materials would be the same so there would be no issues with the quality of the materials but the models would probably be somewhat different in each country. You would need to know the more detailed specifics of the mattress and each of the layers and components inside it such as the type and blend of all the fiber layers and the gsm (grams per square meter) for each layer and the specifics of the wire gauge and coil count for the pocket coil and each of the microcoil layers to know whether it’s identical to any of the UK models but this information wouldn’t tell you anything about whether a mattress would be a suitable choice for you in terms of comfort, firmness, and PPP.
There is more information in post #9 here about the different ways that one mattress can “match” or “approximate” another one. Every layer and component in a mattress (including the cover and any quilting materials) will affect the feel and performance of every other layer and component and the mattress “as a whole” so unless you are able to find another mattress that uses exactly the same type of materials, components, cover, layer thicknesses, layer firmnesses, and overall design (which would be very unlikely) then there really isn’t a way to match one mattress to another one in terms of “comfort”, firmness, and PPP based on the specifications of the mattresses (even assuming that you can find out all the specifications you would need for both mattresses you are comparing in the first place).
Mattress manufacturers generally try to differentiate their mattress from the mattresses made by other manufacturers and don’t normally try to “match” another mattress that is made by a different manufacturer so unless a manufacturer specifically says in their description of a mattress that one of their mattresses in the same general category is specifically designed to “match” or “approximate” another one in terms of firmness or “feel” and PPP and/or they are very familiar with both mattresses and can provide reliable guidance about how they compare based on the “averages” of a larger group of people that have compared them (different people may have very different opinions about how two mattresses compare) … the only reliable way to know for certain how two mattresses would compare for you in terms of how they “feel” or in terms of firmness or PPP would be based on your own careful testing or actual sleeping experience on both of them.
While the Vi Spring and Spinks & Edgar mattresses you are looking at are certainly high quality choices … the quality of a mattress and the suitability of a mattress are completely different issues. I’m not so sure I would limit your search to mattresses that are in the same general category (innersprings and thicker layers of natural fibers in the case of the Vi Spring and innerspring with microcoils and natural fibers as well) since there may be other types of mattresses that are just as comfortable, just as durable, and that may be just as suitable in terms of PPP that are in other mattress categories and in lower budget ranges as well.
There are also some other innerspring/natural fiber mattresses in post #4 here but you would need to check their websites or call them to see if any of them have any dealers that are close to you.
While there are many innerspring mattresses that use microcoils as one of the components in the mattress (in combination with various types of foam or fiber layers) … off the top of my head the only other one that is somewhat widely available that uses multiple layers of microcoils would be some of the Berkeley Ergonomics models.
Once again though … the only way to know how any of them would compare for you in terms of comfort, firmness, and PPP would be based on your own testing or personal experience since every mattress category will have a very wide range of different mattresses and some of them may be a great “match” for you and some of them may be completely unsuitable for you to sleep on.
Phoenix