^ The main difference is that comic books don't have a standard format. It's pretty much up to the preference of the scripter in question. Screenplays and teleplays, though, have a very very very specific format that you have to hew to.
Well. Yeah. There are a few accepted ones and there's what creators work out between themselves but, by format, I meant the way the information is delivered on the page which is, in every case, massively different from prose.
Comic scripting is its own animal, I guess is the point.