I think only a remastered song would be considered a mix, not new vocals... that's a self-cover.
mixes:
TO BE "Original Mix", "Album Version" (not labeled), "2003 ReBirth Mix"
A Song for XX "Original Mix", "MILLENNIUM MIX"
monochrome "Original Mix", "Album Version"
too late "Original Mix", "Album Version"
appears "Album Version", "'99 Greeting Mix"
SEASONS "Original Mix", "2003 ReBirth Mix"
Boys & Girls "AUBE Original Mix" (from the single and LOVEppears), "New Mix" (from A BEST)
etc etc.
The subtle-difference ones are just mixes. Same instruments (maybe one addition, but overall the same), just different adjustments as far as what instruments are louder relative to the others, and vocal effects.
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