Hi ydelle,
There is often very little difference between a full size latex mattress and a queen because manufacturers often use queen size layers and cut them down to full size.
I would keep in mind that some types of memory foam are cooler than others although as you mentioned as a group they are warmer and more insulating than latex. There are also other factors that contribute to the sleeping temperature of a mattress besides just the foam that is used which you can read in post #2 here.
A mattress is only as good as it’s construction and the materials inside it. Any manufacturer can use any materials they choose to make their mattresses and each person will have their own specific needs and preferences in terms of the type of materials or the design of a mattress that work best for them so good testing and knowing what is in your mattress would be more important than focusing on a specific manufacturer. The materials in the mattress and the design of the mattress is always more important than the brand label on the mattress would have little importance to me.
I would also make sure that you have read post #1 here which has all the basic information, steps, and guidelines you will need to make the best possible choices that fit your specific criteria and circumstances.
The most important things when you have specific health conditions that put you “outside of the normal range” would be to connect and work with the most knowledgeable and experienced local manufacturers or retailers that are fully transparent about what is in their mattresses and to make sure you do some very careful testing that is as objective and specific as possible.
Phoenix