Hi tired of pillowtops,
I don’t know the specifics of the materials no but I would certainly make sure that you find out and have all the information you need about #1 and #2 so that you can make sure there are no weak links in either mattress and make more meaningful comparisons to other mattresses.
Once you find out the information you need if you list the specifics on the forum I’d be happy to make some comments about the quality of the materials in either one of them. The Noctova Sleep Orion mattress also says in it’s description that it is a match for the Tempurpedic Grand Bed which is a very different mattress from your “target” so if their description is accurate then it wouldn’t match the Tempurpedic Cloud Luxe. It’s also made in China so it would be worthwhile reading post #6 here as well so you can factor in the slightly higher uncertainty into the value of your purchase and I would also read this article about Mattress Source and Noctova.
They are transparent about the quality of the materials they use (the description of their Elite is here) and the design is similar to the Tempurpedic Elite in terms of the quality/density of the materials and the layering so like the Tempurpedic Cloud Elite there are no weak links in the mattress and for most people they would make a good quality/value choice but foam specs and quality won’t tell you how a mattress “feels” to you or how closely it compares to another mattress in your own personal experience.
Different people will also have different opinions about how closely two mattresses compare and there are some variables involved as well including whether either mattress has been broken in (a new mattress will be firmer than a mattress that has broken in), the temperature or humidity of the room (memory foam changes its firmness with temperature and humidity), differences in a mattress protector or your sheets and bedding, and the more subjective differences between different people’s perceptions because some people are more sensitive to smaller differences than others.
Having said that … it would probably be fair to say that for most people they would be reasonably close in terms of pressure relief and support/alignment but they may have some differences in “subjective feel” because of the different types of memory foam in each mattress which won’t have exactly the same temperature sensitivity or response time (some memory foams have a slower response time than others). There is more about the different properties of different types of memory foam in post #9 here and post #8 here).
In the end … the only person’s opinions about how close a mattress may be or how suitable a mattress may be for you in terms of PPP (whether it’s close to another mattress or not) is you and this is why the return policy can be an important part of the value of a purchase because if it’s “close enough” for you then everyone will be happy and if it’s not then you have the option to return it.
Select Foam has a free return policy (although you will need to buy a shipping box) but there have been some cases where their refunds have taken longer than they should have although I’m not aware of any instances where they didn’t happen even if they sometimes took longer than I would like to see.
Hopefully this will help 
Phoenix