Hey abc123,
Welcome to the Mattress Underground 
! Thanks for joining the group and for your question.
This is a good question. A 40 ILD talalay latex support core is generally considered from a firmness standpoint comparable to a 44 ILD dunlop support core, the difference being talalay’s more “uplifting” feeling. That said, whether talalay latex vs dunlop latex, ultimately it would be different for how you feel vs. how someone else feels.
Here is some helpful guidance regarding “feel” from Phoenix’s post others may find helpful as well, Latex Mattress Choices post #4: “There is absolutely no consensus even among the most knowledgeable people in the industry about the “best” material for any person or circumstances but there is consensus that no matter what materials you choose that PPP (Pressure relief, Posture and alignment, and Personal preferences) is the “best” way to choose and that higher quality materials will last longer than lower quality materials. I would personally prefer all latex for example because it has the unique quality of being both soft, supportive, and durable and many other benefits that are important to me but this would only be a benefit for someone who could feel the difference between a latex support core and a polyfoam support core and would benefit from the differences and of course whose budget allowed it or for someone who even likes the “feel” of latex in the first place (which certainly doesn’t include everyone). While this may be my preference … others who are just as knowledgeable would argue strongly for the benefits of a different choice or combination of materials or components and some may not even feel or notice the difference between them.”
Just curious, where did you try the Pure Talalay Bliss mattresses in your area?
Thanks,
Sensei