[kiwi]

What is difference between those Album Versions and Original Mix songs?

I think that album version will have slight different instrumental with maybe different intro/outro?

Are all the singles Ayumi released like this, where main songs, such as ex. BLUE BIRD, will have one way of the sound, but when on the album, it will sound different? Or is only a few songs unchanged from single to the album?

If it is only few singles unchange (no different with original mix or album version), which one?