No, it’s basically the same except by default it includes their UEK kernel which seems to be based on kernel-ml which supports all sorts of environments such as dom0, domU, Xen and KVM whereas RHEL has gone out of their way to remove all support for Xen.
I’ve taken care of most issues and will test then share my fixes with you guys. Dovecot is the only one that I haven’t had a chance to revisit yet. See the other thread I have CentOS 8 Hosting Alternatives