www.makemkv.com

See 2 playlists that look good on the RB version. i checked online and the katie mitchell cut is supposed to add 40 mins or something like that.

title 615.mpls is 1:49:38
title 616.mpls is 1:52:48

Does anyone know the difference for these files?

I was able to find this:

https://www.blu-ray.com/movies/The-Mitc ... 35/#Review

This disc includes two cuts of the film: the "Original Film" (1:49:38) and the "Katie's Extended Cinematic Bonanza Cut!" (1:52:48 and preceded by a minute-long director's intro). This longer cut includes alternate scenes in a more basic animation style.