Hi masher,
The better online sources for memory foam layers I’m aware of are listed in the component reference post here.
Every different version of memory foam can be different from other versions of memory foam made by other manufacturers in some way and “enhanced responsiveness” is just a marketing term with little specific meaning.
The best source of guidance about how any specific memory foam you are considering compares to Tempurpedic in terms of temperature sensitivity, response time, and firmness will be a conversation with the supplier.
Phoenix