The opening is a bit similar (the first three notes Rina sings on each phrase are similar to Ayu's) but the last note is much higher - not near the note Ayu sings at all.
The feel of the songs - a bit similar, but the production does differ greatly. I mean, when she hits the chorus, the feel is there, but not there at the same time - it's still more slowed-down while Ayu's is more frantic. The verses are pretty different (again, except when Rina sings the opening three notes of each phrase).
The "la la lai's" have their similarities too.
I do notice a few minor similarities, but that's it. Nothing extremely big.
Both songs are very good though. I just heard Rina's for the first time, just now - and it's very nice.
And *Petit*, I'm pretty sure the opening of A Song for xx was major, not minor. The progression of notes in a minor chord is very different.
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