By functional compatibility we mean bug for bug, link the same libraries, the same file lists in the package, etc.
The real issue here is that we now understand that we will never have full binary compatibility
Are you saying there are RPMs that work on RHEL but not CentOS? I.e. there are RPMs with which Red Hat is compatible but CentOS is not? If so, the functional compatibility is limited (because installing and running packages from RPMs is one of the significant functions of an OS), and you really should clarify that whenever you say "functional compatibility."
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