The best answer I can give you is to call your local junk yards and ask them. They can look it up in an interchange book and let you know. Be sure you know the bed & cab size of both units, including wheelbase. WB is measured from center of front axle to center of rear axle. Hope this helps.
another good idea would be to call a dodge dealer ask them if the fit is exact or even simular enough to work they should definatly be able to help you out