I do indeed have a set of RS6 rears on my project car, but it's not a straight forward fit. The carriers have the same bolt pattern but they are about 3 mm out for offset. I had 3mm machined of the mating faces of the carriers to sort out the offset then found that the bolt points on the hub carrier meant that I had to have the disks reduced in size. I cant remember how much they were reduce as I did a guestimate first time and it wasn't quite enough. So had a bit more taken off and still had to file a small amount out of the gullet of the carriers as they were 'just' rubbing.
I wouldn't do it again as my PF D2 now feels a bit over-braked at the back (I have an AP racing custom set up on the front, 6 Pots with 385mm disks and DS2500 pads with are retina detaching). I also had a staggered tyre set up with 10s using 285s on the back and 8s using 255s on the front so understeer with over-braked rear end made it interesting with the back end braking loose very easily and the ESP going nuts!
HtH
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Conan (the Librarian)
Watch it if you dare
Currently,
2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block.
1997 4.2 A8SQ - the Projekt. 12 years and ongoing!
1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard
2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion.
2005 C5 Allroad 2.5TDi FE - Grey - Workhorse.
2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter.
Previously
2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex
1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure.
1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex.
2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on.
1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8.
And a list of non VAG going back 40 years before I saw the light. 
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