Errata for RHEL5 and RHEL6 contains upgrade of modules/system/layers/base/org/jboss/as/clustering/api/main/jboss-as-clustering-api.jar. This upgrade of JAR artifact isn't included in ZIP version of patch for EAP-6.2.1.CP.CR1.
As explained in the list, this is expected as it is not possible to replace just part of RPMs, so all files in jboss-as-clustering, jpa and osgi have to e replaced. The changes are just due to compilation, as verified by patch-gen and by RCM's dist-git script. They should all pass the "smart" comparison that will be used to compare RPMs and patched trees with the full ZIP as agreed in the meeting about patching releases.
We think it should be fixed.
Verified errata for RHEL5 and RHEL6 contains same version of the JAR as zip.