About the opening, I took the audio from the JP ver. and put it in the EUR ver. and it works great (I used dsbuff.exe to unpack the game's files).
I noticed that the EUR ver. last longer than the JP ver. so sometimes the lyrics aren't synchronised with the opening animation like in the JP ver. .
Other thing, I tried to take the file with the lyrics in Fire and put it in Firestorm, it works too. So I did a romaji of the JP lyrics. If someone is interested, I can show you in a video.
I noticed that the EUR ver. last longer than the JP ver. so sometimes the lyrics aren't synchronised with the opening animation like in the JP ver. .
Other thing, I tried to take the file with the lyrics in Fire and put it in Firestorm, it works too. So I did a romaji of the JP lyrics. If someone is interested, I can show you in a video.