CentOS isn't even a split. CentOS is RHEL with different distribution without the trademarks - it's binary-compatible and documentation-compatible, and matches

CentOS isn't even a split. CentOS is RHEL with different distribution without the trademarks - it's binary-compatible and documentation-compatible, and matches versions patch-for-patch. Fedora is more like a split - it's the people who like RHEL but want a faster release cycle.