Hi ps9915,
Organic Dunlop and 100% natural Dunlop are basically the same material (they are both made from 100% natural rubber) and the main difference between them would be the organic certification itself, not the feel or performance of the material. There is more about organic Dunlop latex in post #6 here. If an organic 100% natural Dunlop core and a non organic 100% natural Dunlop core were both the same density and thickness then they would have a similar firmness level as well.
Phoenix