one thing that distinguishes rc from release version is that a vm won't download ota if it is rc unless it is sequoia.Mist presents and downloads them as full release versions.
so if you have ventura betas/rcs as a vm and try to do an ota update to another beta or rc it won't work. you have to use the full installer to update.
on the other hand if it is a release version a vm can update ota.
in the case of 13.7 rc 1 i could not update my vm ota, which indicates that it is a rc not a release version. i used the full installer to update.
of course many times but not always the last rc has same build number as the release version and then a vm could update ota
but i don't think 13.7 has come out as a release version yet