...As the Grand Inquisitor was once a guard at the Jedi Temple on Coruscant, and there were many guards of the same Pau'an species in the Clone Wars/Rebels, perhaps there is a later SUCCESSOR to the Grand Inquisitor of the same species?
But Reva seems... out of place? The portrayal is not refined or professional, the way you would expect a Jedi now pseudo-Sith to behave or act, especially with dark side force powers at their disposal.
Yeah I'd say it's at least possible this Grand Inquisitor is not the same one we've seen. Could explain the difference in appearance besides artistic license of the cartoons or even simplification of the live action Pau'ans we've already seen. Otherwise, it's pretty goofy to "kill" him off unless they're banking that most haven't seen Rebels. Unless he has regenerative abilities, he should be dead, as nonsensical as that seems to be. If they later have him recovering in a bacta tank, well then I guess Qui-gon and anyone else that have been stabbed by a lightsaber simply didn't receive adequate medical care. Lol! And totally agreed about Reva. I can't tell if the actress is just not very good or the character was just written in an awkward, cringy way and she's just trying too hard to work with what she's been given.