No mate any pads that fit the RS6 C6 or C7 Iron discs will fit the calliper just fine.
The surface area is the same on the 360mm as the 380's on the RS and also the same as the 400's discussed here, the difference is just the overall size, so even though contact area is the same because the circumferance is bigger you get better heat dissapation mainly.
I havent tested this theory other than with the DS2500's that state they are for a C6 RS6, and they are the same Brembo Calliper.
Get them bedded in and do a few stops to get some heat into them, you'll be mentally suprised, i'd change your fluid for some higher temp stuff... Radi Cal R4 or Castrol SRF is the highest but most expensive, some RBF600 or similar would do fine mind, you'll find the fluid will now be your weak spot in the brakes.
Not yet i have emailed him as the listing is no longer active, and its a 7 day turnaround so i might not get them till next week now.
No hassle, i will review once i get them on