But the rest of the packages are either:
1. Directly from SLE, meaning that they have the exact same version, patches and build setup (they're rebuilt on the External OBS though). These are kept up-to-date with maintenance releases for SLE (which is what I meant by "up to date").
2. Community-managed, meaning that they were not available in SLE and the community added them.
Admittedly, the kernel is the one case I know of where this is not the case. CentOS might be comparable, but I don't know whether or not RedHat actually contributes to CentOS (we contribute to OpenSUSE).