I did check part numbers and they are different so I might try it and see what happens…..IMO, i doubt it will fit. I ran into the same issue for my cover from agricover tonneau cover.com, when i went from my 2018 to a 2021 did not fit, and i had to order a new one. I suggest going to a website, order one for the 4th gen and one for the 5th gen and see if they are same model number. If they are, your good to go!
GLAD TO HEAR IT WORKED FOR YOU MAYBE POST SOME PICS OF THE GAP TO OTHERS TO REFERENCEUpdate:
Got the tonneau cover to fit actually. It seems to fit fine. There’s a slight slight gap where it meets the tailgate but I think I have to shimmy the cover back. It got dark out so I went inside lol