I played this a while back (fantastic game, I should play through it again), and as far as I can remember the sprites for actions that appear in both modes (idle, jumping, Kamehameha, etc) are slightly different in each of the modes. I could be wrong though, it was quite a while ago, and I didn't really pay attention to these kind of details back then as I do now.
If they are different, I would put them in different sheets, otherwise on the same sheet.
(Also, as a suggestion, if you put them as different sheets I'd call them "Goku (Adventure)" and "Goku (Tournament)".)
If they are different, I would put them in different sheets, otherwise on the same sheet.
(Also, as a suggestion, if you put them as different sheets I'd call them "Goku (Adventure)" and "Goku (Tournament)".)