Hi cristyhawaii,
There is Talalay latex that is 100% natural but there isn’t any organic certified Talalay latex … only Dunlop latex.
It’s unlikely that they will provide you with the ILD of the individual layers but even if they did it won’t help you as much as you may think because ILD is only one of several specifications that will affect the firmness/softness of a layer and the mattress as a whole (see post #4 here). For example … if two mattresses have layers that are all the same ILD but if the thickness of any of the layers are different or the type and blend of the latex in any of the layers are different (ILD doesn’t compare well between different types and blends of latex) or if the specifics of the cover or quilting are different then they would likely feel different from each other even if the ILD’s are the same.
Your testing can give you a good sense of whether you like the overall feel of latex and whether you tend to do better on or prefer softer, medium, or firmer mattresses but unless all the layers and components in two mattresses are exactly the same (same type and blend of latex with the same layer thicknesses and ILD and a functionally similar cover) then it’s very likely that they won’t feel the same.
When you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using (fast or slow response, resilience, firmness etc) and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked or other mattresses you are considering that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs and firmness levels to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with) than anyone else.
Phoenix