The two sites are very much working together; they're part of a small network of tech-oriented sites owned by the same group.
CoderZone was developed to serve a wider, more general programming-oriented audience than PSOUG, which is focused almost exclusively on the Oracle database. The code library from PSOUG was ported over to used here, but the PSOUG one isn't usually updated unless it's Oracle-related code. The one here has snippets added to it every so often.