This pack replaces your choice between NXT, NXT 2.0, or WCW with New Japan Pro Wrestling. 

This pack replaces all brand menu assets in MyGM mode, as well as all MyGM specific arenas, GFX and transitions. This does NOT include any belts, characters, general managers, or PPVs/PLEs.

Replacing WCW will not affect anything outside of MyGM. 
Replacing NXT (black & gold version) will only replace the Transitions.
Replacing NXT 2.0 will replace the default NXT 2.0 Arena, as well as GFX and transitions.