I would like to have different buttons for different parts of the game. but only one will be activated at a time.
It's better to stick to one button. But what you describe is still close, so it's okayish (depends on what you mean actually, I don't really know).
Except of course if the button changes frequently, then it's totally out of the jam spirit.
But if you have different chapters and feel like it would make sense to change button for new chapters, why not.
