Hi Adidas,
I believe that Flexus uses Latex Green for their 100% natural Dunlop.
I’m not sure who they use (Radium or LI) for their Talalay.
If the type, blend, thickness, and firmness of the latex layers they have available are the same and the specifics of the cover is also similar then they would both be very close in terms of their design so the differences between them would be in the other parts of your personal value equation that may be important to you including any differences in their exchange or return policies.
Phoenix