E & A defines the licensing model, A represents Advantage which has extra features compare to E (Essential).refer below matrixEnterprise Networks Software Subscription Matrix for Switching - Cisco
Use command in Configuration mode, which will bring your interface to default configuration.default int gig X/XDefault int range gig X/X - X (for multiple interfaces)
WLC#show chassis rmi WLC#show redundancy
It will show you the redundancy status.
To Test, You have to reload chassis 1 and check the services are moved to secondary and everything works fine and AP's & clients move to secondary WLC. And check redunda...
You don't have to worry on the versions, Just check the Major part number CVR-QSFP-SFP10G and check compatibility matrix and you can use it. Might be V1 & V2 will be for the manufacturing.