Lore-wise, since they all rely on infinity energy, it seems reasonable that the same item could allow for all three features to be used, and there's been nothing shown to suggest otherwise. The only difference in game might be the pokemon the band was a piece from, or has the energy from - namely the gen 6 legends, necrozma, or eternatus
The dynamax band model could just become another swappable model, like with the key stone models.