Hi madinsomniax,
Unfortunately there really isn’t any way to compare your convoluted toppers to something else (especially if it’s a different material completely) outside of side by side testing on the same mattress because I don’t have any information about it.
Typically though … it would be in a “soft” range although softness is very subjective and one person’s (or manufacturer’s) definition of soft can be very different from another.
In terms of Talalay latex … 24 ILD is generally considered to be soft (you can see Latex International’s “word ratings” for different ILD’s here) although once again this will vary between different manufacturers. ILD is also only one of several factors that affects how soft or firm a material feels and by itself can be somewhat misleading (see post #6 here).
While there are too many unknowns, variables, and personal preferences involved between different people to use a formula or specs (either yours or for a mattress or topper) or “theory at a distance” to choose a topper that can be particularly effective … post #2 here and the topper guidelines it links to may be helpful and will give you a way to use your actual sleeping experience as a guideline to help you choose the thickness and softness of a topper that may work best for you on your mattress.
Phoenix