Hi JJC,
If they use the same type of materials and components then they would be closely comparable in terms of durability.
[quote]The major differences are Alpaca wool cover vs regular wool, the layered construction and a split design that allows each sleeper to customize the feel.
6 Firm with 4" Soft Organic Natural Latex for $2798 and a 3" Firm+3"med+3"soft+2" extra soft for $2,999 normally $3,999.[/quote]
Every layer and component in a mattress (including the cover) will have some effect on the feel and performance of every other layer and component and the mattress “as a whole” so two mattresses that have a different design will have a different “feel” and different properties and a different firmness level. One of the designs may be a better “match” for you in terms of “comfort”, firmness, and PPP than the other one. Some people may notice the differences between them more than others depending on their body type, sleeping positions, and on where they are in the range between “I can sleep on anything” and “princess and the pea”. The most reliable way to know which one would be the best “match” for you will be based on your own careful testing (hopefully using the testing guidelines in the tutorial) or your own personal experience.
There is more about the pros and cons of a side by side split layer design in post #2 here.
Outside of any potential differences in that may affect PPP and how well you sleep on one or the other one … one isn’t inherently better or worse than the other one but if either or both of the mattresses are component mattresses with individual loose layers and a zip cover that allows you to access the layers then having more layers gives you more options to rearrange or exchange layers in different layering combinations so that you can customize the feel, pressure relief, or support of the mattress in different ways after a purchase if your original layering combination doesn’t work out for you as well as you hoped for (see post #2 here).
Phoenix