Hi lkirik2000.
Welcome to our Mattress Forum! 
I can save you the trouble of finding out the layering of this mattress as I found it in some old records for the PTB Ballance (9")
- 2" ActiveFUSION Fast Natural Talalay; This is blended Talalay latex with phase change gel added to help with temperature regulation. It is a high quality and durable material.
[li]7" Bonded Foam/Latex: This is a blend of polyfoam and latex similar to carpet padding where pieces of each material are compressed and bonded together. it is also a very durable material.
I am not very sure what the ILD is but you may want to call Sleepworks here to see if they have the complete specs and then hand this over to Ken to help you approximate the feel you are looking for.
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This would be what is called a latex hybrid which is a combination of latex in the comfort layers and a polyfoam support layer (or in this case a type or latex/polyfoam blend). This mattress was on the lower end of their line because it only has 2" of latex but all the materials were good quality and durable. The latex comfort layer may have been a little on the soft side (I am not very sure but I believe that it was 19 ILD) but it was also thin so that the “feel” of the firmer support layer did come through enough.
You can also read more about a polyfoam/latex hybrid and how it compares to an all latex mattress in post #2 here. In the case of the PLB, the support layer is higher quality than “regular” polyfoam so the difference may not be as much although how each performs and feels to you would be my primary consideration.
You are on the right track by seeking guidance from an experienced manufacturer such as Arizona Premium. Ken is very knowledgeable and extremely experienced to best approximate a mattress feel based on all the specs and your personal needs and preferences you may provide.
I know the feeling of finding something just right and striving to replicate it … good luck with the mattress matching.
Phoenix