Generally I don't think this is a problem.
Audi build their RS in such limited quantity, they aren't even available in US. You can't compare cars that you can't actually buy.
Plus I don't think a car that looks exactly same as an A4 is very appealing anyway.
2011 535i Alpine White, Oyster on black interior, Premium 1 & 2 Package, Magnaflow Full Cat-Back Exhaust, JB4 Stage 2