Is mod_cluster in EAP 6.2 compatible with old release of EAP 6.0.x and 6.1.x

Issue

• Is mod-cluster 1.2.6.Final provided with EAP 6.2.0 GA compatible with old release of JBoss EAP 6, e.g. EAP 6.0.x, EAP 6.1.x?
• Does mod-cluster provide backward compatibility with old release of JBoss EAP 6.0.x and EAP 6.1.x ?
• Is it safe to keep the mod_cluster version outdated, or it may cause some kind of problem?
• In our environment we currently use JBoss EAP 6.01 and 2.0 with JBoss EWS mod_cluster / 1.2.3.Final.We are now considering migrating to JBoss EAP 6.3. Can we continue with JBoss EWS 2.0 mod_cluster / 1.2.3.Final? Or also be migrated?
• Doubts About Jboss EAP Update.