I think, Ayu maybe planning GREEN as her summer single at first, so she decided to go on happy tune (for me the CM version is summer pop) and thus, Panasonic used it as the CM song.
But maybe because there are some problems regarding the release, she holds it back for winter and adjust the tune to more fit in the winter time, or some sort.
I like both of them actually, I thought that she would put the CM version in the single, but she didn't. T_T
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