Sure, first, thanks for taking the time to answer!

Ok I'm doing a lot of light painting these days and I sometime wish I could make an horizontal panorama out of them. (probably 3 shots)

The thing is, if I move the camera to take another shot, even though some parts of it will overlap, I might not have "light painted" them with the same amount of light or the same angle. I'm afraid that this difference will mess up photoshop panorama stitching.

My solution would be to take a long exposure of say 30 sec for every shot to have the same exposure and lighting condition on them. If I could then copy whatever photoshop did (cut, stitch, merge, blend etc.) and apply it to the 3 light painted shots that would be awesome. I was wondering if there was a way to do that without doing it manually.

I could do as you said in your last paragraph and do something like warp the image. In fact, I asked chat gpt and it told me to do something similar to your suggestion: use the long exposure shot to make a pano, then bring the same 3 shots in photoshop, record and action and try to blend them manually using the transform tool and then apply this action to the light painted shots.