Hi jayD2014,
Not particularly no. It only has an inch of latex which really isn’t a significant part of its design and there is so little latex and more polyfoam than latex in the comfort layers so it wouldn’t give you much sense of what the latex would feel like in thicker comfort layers or be a particularly useful guideline for any of the firmness levels for the Ultimate Dreams.
If some careful and objective testing indicates that the Prana Firm was a good match for you in terms of PPP then the only real “guideline” it would give you would be a very generic indication that you do well with mattresses that are on the firmer end of the range. You would probably be better off testing a mattress that used thicker layers of latex in the comfort layers (particularly Talalay latex) to get a better sense of what Talalay latex “feels like” in different firmness levels or mattress designs.
The better options or possibilities I’m aware of in the Bridgewater, MA area would be listed in the Boston list in post #2 here and in the Providence list in post #4 here. You would need to make some phone calls to find out which if any of them carry a mattress that has a similar design and layering (or at least a similar amount of latex in the upper layers which is what you will “feel” the most" when you first lie on a mattress) that would also provide you with the specifics of the “comfort specs” of their mattress (such as ILD) but some of the Spring Air latex hybrids
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have some similarities (you can see some comments about them in post #5 here) although they are also different designs and use different combinations of material and layer thicknesses and you may not be able to find out the firmness of the latex or other layers inside them because this is a “comfort spec” that many retailers don’t provide. In many cases even relatively small differences between two mattresses can make a surprising difference in how they feel and perform for some people but they at least are in the same general “latex/polyfoam hybrid” mattress category. There would probably be some others that are in a similar category as well.
Phoenix