CC with existing SVN repository

We have a large SVN repository of accepted - via internal audit - code, which will form the starting point for the next release.  We want to now fully integrate CC (we already use it) to replace the internal audit method, specifically:

1) To use CC in the "review after check-in" mode *and*

2) To consider the latest repository version (as of today, not going forward!) as representing the latest "reviewed" files.

That is, I have myfile.cpp @rev 91073 and when I update it I want CC to consider 91073 to be the base, and show the newer version as a diff, rather than the new version as entirely "new".  I think it might actually work like this but can't confirm from what I've been able to read.