tbh I don't know if it matters at all, for example we have separate entries for AC Revelations digital volumes:
http://vgmdb.net/album/29868
http://vgmdb.net/album/29870
http://vgmdb.net/album/29872
and another one that has all-in-one package
http://vgmdb.net/album/29874
there were indeed four available choices for buying and we covered them all so it's probably fine to add these D4 separate entries either way... Just saying.