Regarding swapping door panels:
I tried swapping door panels in the junkyard. If you are willing to rewire it all, it works. It will be extensive and fiddly.
If you have manual windows and locks, it works.
If you have the older style power locks and windows, and are willing to fab new panels for them, it works.
If you just want to swap one for one, in an afternoon without hassle, you can forget about it.
I spent an hour and half figuring that part out, so you don't have to. You are welcome.
I was also hoping for a slightly updated and neater door panel, and in the end, I put all back where I got it and left empty handed. I put new carpet on the bottom of the door panel and called it good. Also, why do these older door handles get so dirty. Ugh.
The junkyard closest to me has a few with the grey panels in them.