How does the OCC front bumper differ from the Caprice?

I was looking at pictures of the two, and other than an opening in the lower front of the OCC, they look the same. I have a perfect OCC grill and grill mount, and was wondering if I got a Caprice bumper assembly (much easier to find than the OCC) if I could put the Caprice bumper with the OCC grill on my Roady and not have any big gaps or overlaps anywhere. I can't find the chrome parts for the Roady bumper (mine are all bent out of shape), and I think the Caprice cover looks cleaner anyway. Has anyone done this particular swap?

Yup works perfect. Caprice bumper with occ grille AND either caprice or occ grille support is a perfect fit