Is there a unique identifier for audiobook?

I have been listening to more books than I have been reading these days and I want to be able to add them properly on my book tracker.

Is there some unique identifier for an audiobook? I guess the ISBN of the book will tell me the exact words of the edition but the same words with another cover have a different ISBN and the same ISBN is used for to different narrator.

What do you know about this topic? Thank you in advance.