Hi rmonce,
Just in case you haven’t read it yet … the first place to start your research is the mattress shopping tutorial here which has all the basic information, steps, and guidelines you will need to make the best possible choices … and perhaps more importantly know how and why to avoid the worst ones (including the major brands such Stearn’s & Foster or the large chain stores … see the guidelines here).
There is more about the different ways that one mattress can “match” another one in post #9 here but the only way that another mattress would be the same as the Emily pillow top would be if it had exactly the same layers and components and it would be unlikely that you would find another mattress that was the same although there may be others that use similar materials in more general terms.
Two of the more important links in the tutorial that I would especially make sure you’ve read are post #2 here which has more about the different ways to buy a suitable mattress (either locally or online) that is the best “match” for you in terms of what I call PPP (Posture and alignment, Pressure relief, and Personal preferences) for your body type, sleeping positions, and preferences that can help you assess and minimize the risks involved in each of them and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful comparisons between mattresses in terms of suitability, durability, and value.
While it’s always a good idea to do some local testing to find the types of mattresses and materials that you tend to prefer in more general terms … it would be a very time consuming and laborious process to use the specs of another mattress as your “target” and it wouldn’t be particularly effective anyway if you have never tested the Emily pillowtop and don’t know how it feels to you and couldn’t compare the most important part of the “value” of a mattress purchase.
If you let me know your city or zip code in Louisiana I’d be happy to let you know about the better options or possibilities I’m aware of in your area.
Phoenix