I'm getting close BTW of discovering some tricks to make gifs in Photoshop much quicker, smoother, and using easier methods. I may start off discussing this method with 5 people via PM - since that is now this new fucked up PM limit. So far I got you and
@Myrddin Wild. Need 3 more people. It's gonna be so strange but I just did something that could have taken quite a few hours and it took one hour and is smoother. Now that I know what I am doing, it may take less. And you can swap out heads with basically one copy/paste. So suppose you make one with "Mean Looking Jone Jones" and you decided you want to use another head instead with "Smiling Jon Jones" you can swap him out without having to remake your million frames.
Mind you that for the last two years I have only been using Photoshop to cut out and color correct heads for gifs, and using Adobe After Effects to make the animations. So perhaps I have been behind the times in Photoshop gif making. But after you said you needed some help in smoothing out gifs, I went back to PS and recreated your Jones/Coke gif and figured out how to do that 13 seconds pretty darn fast. Some others may already know this method since I am behind the times a bit, but to me it's much better.
I made the gif with Jones and swapped out Jones' head for a Ngannou head and it took 1 second. I would like to spend some more time practicing it before I start the PM.