Tom Diehl wrote: ...
No. The versions for Centos are always higher then RHEL. Therefore unless the updates RHEL versions happen to be greater then the existing centos versions you will never get the updates.
I'd think that it would be technically possible to migrate a CentOS system to RHEL by "reversing" the process documented on the Wiki for migrating RHEL -> CentOS; however, the real issue is likely to be that RH is not going to support it without a fresh RHEL install. Either way the answer is still "No".
Phil