A6, S6 and RS6 grilles...are the interchangeable?

[Vieussuex*]

I'm looking at going black optics on my RS6 and I was under the impression that S6 owners bought RS6 grilles to get the honeycomb RS grill look and that A6 owners bought S6 grilles for the S line look.

I've bought a cheap eBay black grille meant for A6/S6 with the honeycomb RS thinking it would fit but the seller seems to think it won't...but he is not sure!

Anyone had experience fitting aftermarket RS grilles to the RS6 and was it RS6 specific?