Yes, the B7 rotors are almost flat, whereas the C5 has about 6mm more offset iirc. That's all down to the C5 RS6 having more offset on the hub as it uses D2 wheel hubs (which sit 6mm further out than B5 / C5 A models, so the disc is different to accommodate that. The B7 I suspect uses the same upright geometry but the A wheel hubs.
I haven't had the two calipers side by side to compare. The part numbers are very close, and from pictures they appear to be the same.
The conversion I did involved removing the 90 degree adapter plate which comes stock on the RS calipers, and then fabricating the flat plate to maintain the radial mounting. I suspect it may be possible to retain the adapter and use A8 uprights with axial mounting, although it may need some spacers and / or A wheel hubs. I was to find that out this year until corona messed everything up.
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