To be fair Souffrir, the only differences between both the the ACA and the CodeMystics versions of The Last Blade 2 is that the ACA NG version is based on the MVS version (with various options [game, audio, and display wise] to change in-game.), the cross-buy/save/play PS4/Vita CodeMystics version is based on the AES version (with the boss character playable, but done as a button code). Some options vary in that too, but it does have unlockable artwork and you can play online against players on both versions.
But in retrospect, both versions will play the same. (Since its the same game with some minor differences between both ACA and CM versions.)