Can someone confirm for me that body and bumper parts for '87 - '91 Bonnevilles and corresponding Buicks are interchangeable ?

I'm still looking for parts for my dad'* '87 and sources of rust free and dent free parts seem to be a little hard to find.

Thanks in advance.

Tough to say, bumping to get this back in view.

Pretty sure Bucik and Bonne won't swap. Totally different body style. Buick and Oldsmobile are close in many body parts but nt the Bonnie'*.