JAR file modules/system/layers/base/com/sun/jsf-impl/main/jsf-impl.jar contain different content of files com/sun/faces/LogStrings_*.properties compared to ZIP. It is possible that the root of cause is only different items ordering. Also content of META-INF/MANIFEST.MF is different.
Still valid for EAP-6.1.1-ER3 on RHEL5.
nack is for 611 only
Still seen in EAP-6.2.0-ER3
Built glassfish-jsf-eap6-2.1.19-1.2.redhat_1 that wraps ant build. A move to MEAD (maven build) will likely come in a future release.
https://github.com/jbossas/jboss-eap/pull/618
Fixed in ER7 build.