Where Used

Is there a way to find where instances of an NPC exist? Like which maps contain them? I own curse of Strahd for example and I want to change the token used for some of the NPCs. But I don't know which maps they exist on.

I believe there are ways to do this with the API, which requires a Pro membership), but as far as I know, no way to do it otherwise. Without the API, the best bet would be to set up the new default token, and do a quick drag and drop replace whenever you find them. With the API, I think there's a script called tokensync, which detects changes to a token and propagates them throughout the game.