Hi Kevinmay,
Savvy Rest only has two options in terms of the type of latex they offer. One of these is 100% natural Talalay and they recently changed to Radium as their supplier. Radium is one of the Talalay options that SleepEz offers as well. The other option they offer is 100% natural Dunlop that is organic certified and is supplied by CoCo Latex. SleepEz also offers 100% natural Dunlop but theirs is made by Latex Green and is only available in certified organic with a special order. Latex Green and CoCo latex are both high quality Dunlop latex manufacturers and their products are closely equivalent in terms of quality and performance. If the organic certification is not as important to you … then SleepEz also offers 100% natural Dunlop also made by Latex Green as their standard layering that has the same performance and properties as organic except it doesn’t have the organic certification and is a lower cost. SleepEz also offers blended talalay for those where 100% natural Talalay is not as important. You can read more about the different types of latex including organic in post #6 here.
To compare the covers you would need to know the type and amount of the wool that was used in each and the specifics of the organic cotton that is used in each on each side of the wool quilting. This can be very technical as you can see here and the law of diminishing returns may apply because both covers use high quality materials (organic wool and organic cotton) and while there would likely be differences between them that can affect the cost of the cover, it may not make a significant difference in how each mattress actually feels and performs (see post #31 here for more about how their covers compare)
Finally … there is the issue of comparing the softness and firmness of the latex in each layer. To do this you would need to know the density or ILD range of the Dunlop latex or the ILD range of the Talalay latex. ILD is not an exact specification and Dunlop in particular can vary much more than Talalay even across the surface of the same layer. ILD is not really comparable between Dunlop and Talalay because ILD is only one of several factors that contributes to the softness of the mattress but if you are comparing Talalay made by the same manufacturer and they are in the same range they would be closely comparable. In many cases the density of Dunlop is a more accurate way to compare the relative softness levels between Dunlop manufacturers but in general a soft with one Dunlop manufacturer would be roughly comparable to a soft with another manufacturer as well (or to a similar density) within a larger variance than with Talalay.
So to have a close approximation between two mattresses in terms of the latex (excluding the effect of the cover) … you would need to use the same thickness of layers in the same material with a comparable softness level (ILD in the case of Talalay and ILD, density, or “word rating” in the case of Dunlop). Of course this would require knowing the firmness/softness of each layer at Savvy Rest and the equivalent that was available at SleepEz.
Savvy Rest doesn’t usually provide exact specs for ILD (and it’s not necessary with a local purchase because this is a “comfort spec” that you can test yourself and has nothing to do with the quality of the material) but you can see the range for each of their materials in post #2 here.
So overall … you would be able to come very close with the Talalay (which is made by the same manufacturer in both cases) and “fairly close” with the Dunlop as well so the variances would be slight differences in the ILD of each layer and in the effect of the cover itself.
To keep it simple though … when you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart (which would certainly include SleepEZ) and who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using (fast or slow response, resilience, firmness, etc) and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked or other mattresses you are considering that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs and firmness levels to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with such as the Savvy Rest) than anyone else.
SleepEz also has a more generous exchange and return policy than Savvy Rest which may also be an important part of your final choice between them along with the “value” you attach to being able to test a local mattress in person vs a close approximation that you can’t test in person before an online purchase.
Phoenix