Kikuchi worked on both, although I don't know if he composed Doraemon's ending "Boku-tachi Chikyuujin" but, is it just me, or does these two sound very similar?
Dragon Ball
Doraemon
If you can't hear it, go to 7:31 on Dragon Ball's video and sing the lyrics from Doraemon starting from "Lalalalanlalalalalanla uta wo utaou" into the chorus.
Dragon Ball and Doraemon
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