Hi rd3482,
There really isn’t any way for me (or anyone) to know either of these because there are too many unknowns and variables involved besides just the type of foam in your mattress. As I mentioned most people wouldn’t experience temperature issues with this mattress and the most reliable way to know whether a mattress is a good match for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) is your own careful and objective testing (hopefully using the testing guidelines in the tutorial post) or your actual sleeping experience. I certainly wouldn’t buy any mattress if your testing indicated that it wasn’t a good match for you.
There are thousands of different types and designs of latex mattresses (and any other type of mattress as well) and some of them may work very well for you and some may not be suitable for you at all. It would depend more on how well a specific mattress design matches your unique needs and preferences in terms of PPP than on the type of material that it uses.
Having said that … shoulder and neck pain can often be a pillow issue just as much as a mattress issue because a suitable pillow will keep your head and neck in better alignment and can also help with shoulder pressure. There is more about pillows in the pillow thread here.
Phoenix