Yes that's an RNS-E (I believe an earlier version because it doesn't have the "Media" button, can anyone confirm?) and I am fairly certain the faceplate for a 2005 Allroad is the correct fit for a C5 RS6 (both are facelift C5 models), so physically it should be a direct fit. However, as Ben suggested you would probably want to confirm hardware and software version compatibility just to be safe.