Nope - none of the body parts switch back and forth between the CJ and Commando (unless you want to get real creative) except for the front clips with a little bit of work.
I just sold my last perfect windshield frame and glass. They come up for sale time to time on Ebay. You could post a "Wanted" ad in the classified section. I think just about everyone here has a few parts Commandos lying around.
Don Fletcher, Mark Vilbert, Toad and a few others are good direct sources as well.
Good luck!