Hi bucboy14,
Welcome to the Mattress Forum! 
I’m sorry to learn about your issues with your Tempurpedic from a scratch and dent store, and unfortunately as you found out, items that are listed as this are not offered with a manufacturer’s warranty (they’re often mattresses that have already been returned for warranty defects). I strongly encourage anyone to proceed with abundant caution when considering a purchase of this nature. This video speaks about this a bit more. I’m sorry you had this happen to you.
Unfortunately, it’s not possible to tell how a mattress will feel and perform for any specific person based on the specs or density of the materials as compared to another and it would depend entirely on the person and which mattress design was a better match in terms of comfort, firmness, and PPP. The only way to know would be based on your own careful testing or your own personal experience when you sleep on it.
Both of the Christeli mattresses you mentioned also use good quality materials and there are no lower quality materials or weak links that could compromise the durability or useful life of either of them relative to any weight/BMI range either but once again when you can’t test a mattress in person then your best source of guidance about which of their mattresses may be the best “match” for both of you will be a phone call with Christeli, and ask them which model they offer would best approximate the Contour Select.
I would also keep in mind that Christeli has a 50 day exchange policy that allows you to make a single exchange for another mattress but they don’t offer a refund policy so if you don’t sleep as well on one of their mattresses as you hoped for then your only options would be to add a topper (if the mattress is too firm) or to exchange the mattress for another model that is either softer or firmer.
Just for your own information, the last older specs I have of the Contour Select are:
1.2" TEMPUR® softer material Comfort Layer (5.3 lb/ft3 density)
2.8" TEMPUR® firmer material Support Layer (5.3 lb/ft3 density)
6" Convoluted HR, AirFlow System™ Base Layer
I’m not able to maintain a listing of all of the offerings that manufacturers currently have available, but in general there are really 3 ways that one mattress can “match” another one.
The first of these is in its feel and performance. While the quality of materials may not be the same (lower quality materials can feel the same as higher quality materials when they are new but won’t remain close to their original specs for as long once they soften and break down more quickly) they may “feel” very similar in side by side testing … at least for a while.
The second of these is with the quality of materials. This means that two mattresses may use the same quality of materials as another mattress and may have roughly the same durability but they may not feel the same because different foams of the same quality can have a very different feel and different designs and layer thicknesses can also mean that two mattresses with the same quality materials can be very different as well.
The third way they can match would be in design where one mattresses uses the same thickness of materials and layers and the same quality materials as well but they still may not feel the same because of differences in how similar quality materials can feel and differences in the softness or firmness of similar quality materials. In this case for example you could have one mattress that used 2" of 4 lb memory foam over 2" of 5 lb memory foam over 6" of 2.2 lb foam which could feel very different from another mattress that used the same quality/density of materials but where the feel and performance was very different.
So different mattresses may approximate another one (they will not likely be identical) in one or more ways … feel, material quality, and design. You may be able to find a mattress with a total amount and density of memory foam that is similar to the Contour Select, but in each mattress the type and properties and mixture of the memory foam will be slightly different along with the differences in the support system, so there really will be no way to get the “same” feel. But you may be able to find something similar, and the best way to determine that would be a detailed phone conversation with any memory foam company/manufacturer you are considering.
If you want to look at other brands, you may wish to start with the members listed in post #21 here who are all very experienced and knowledgeable and specialize in providing the type of help and guidance on the phone that can help you make good choices. There are a wide range of memory foam options included in the choices there and I believe that all of them compete well with the best in the industry in terms of their quality, value, service, and transparency. In addition to the online members of the site listed in the previous membership link … post #12 here has some of the better online memory foam options for those who are looking for a memory foam mattress.
I’ll be interested to learn about any details you receive from Christeli should you phone them, and any subsequent decisions you make.
Phoenix