End roll definitely has a new mix, the drums are punched up alot, which you can hear very readily when the vocals kick in. Boys & Girls only has a new mix though, while End roll got new vocals as well.
Why they're unlabeled, I'm not sure. Sometimes we get surprises. monochrome & too late on "LOVEppears" have new mixing and aren't labeled as "album version" or "album mix" in the booklet... at the time, it just happened occasionally I guess. Either that or avex was mad she re-recorded the songs and decided to downplay that there was as much new content as there was. Doubtful and kinda stupid, but possible.
As for why she re-recorded them, don't forget that at the time Ayu was angry about A BEST getting released. As devoted to her fans as she was, she wanted to make sure the album purchase wasn't a ripoff, so she re-recorded the songs so there'd be a reason to buy it.
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