Hi Dave75,
I’m glad you found us before you made your purchase and as you probably know from reading the earlier posts in this topic I would avoid buying a major brand mattress or any mattress that uses lower quality and less durable or “unknown” quality materials.
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 and quilting, layer thicknesses, layer firmnesses, and overall design (which would be very unlikely) then there really isn’t a reliable way to match one mattress to another one in terms of “comfort”, firmness, and PPP (Posture and alignment, Pressure relief, and your own Personal preferences) 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 (regardless of anyone else’s opinions of how they compare which may be different from your own) would be based on your own careful testing or actual sleeping experience on both of them.
This doesn’t mean that other hybrid mattresses that have a different design wouldn’t also be a good “match” for you because each mattress category will generally have many mattresses that would make a suitable choice … only that they wouldn’t be the same as the Cooper and that the only way to know for certain whether they were better, worse, or similar in terms of comfort, firmness, and PPP would be based on your own careful testing or your own personal experience.
Subject to first confirming that any retailer or manufacturer on the list you wish to deal with is completely transparent (see this article) and to making sure that any mattress you are considering meets your specific criteria and the quality/value guidelines here … the better options or possibilities I’m aware of in and around the Novi, MI area are listed in the Ann Arbor/Detroit list post #2 here.
There are also lists for the Lansing, MI area in post #2 here and for the Portage/Kalamazoo area in post #2 here that would be closer to Jackson, MI.
Phoenix