Change specific/one color on a paper2d sprite

Okay, this actually works perfect on the real project sprites in a new project (something I should have tried in the beginning). I’m guessing because Simon’s feet kind of need redoing it doesn’t look so good, but on the real sprites it’s as perfect as can be. Now I just need to figure out how to apply this to all sprites in a flipbook, and why this doesn’t work in the real project. I really appreciate the help, and I will now mark your reply as the answer.