Yes, there can be multiple versions or iterations of Shazam in the comics, depending on different storylines and universes.
Sometimes there are. Different comic arcs and continuities might introduce multiple takes on the Shazam character. This could be due to alternate timelines, multiverses, or creative reinterpretations.
It's possible. Comics often play around with concepts like alternate realities and character variations, so having multiple Shazams isn't uncommon. It all depends on the specific comic storyline and the creative decisions of the writers and artists.