Hi dmartin1910,
Latex is a completely different material from memory foam (and they are more opposite than similar) so I don’t think there is a latex mattress that would be similar. Post #2 here has more about the differences between them.
If you are considering buying a latex mattress I would test some local latex options so you have some reference points for different types and firmness levels of latex mattresses.
Post #12 here has a list of some of the better online manufacturers and retailers that sell memory foam mattresses and some of these sell memory foam mattresses that approximate the Allura and use it as a reference point that may be worth considering if you have tested the Allura and it’s a good match for you in terms of PPP.
Phoenix