Hubcaps on ralleys?

Will full hubcaps fit on ralley rims? Kind of a stupid question, but I was at a pick and pull a year ago or so and saw what I think is the premium hubcaps for late 60's Darts sitting in an old car, and have thought about going back and seeing if they are still there. I realize I would have to remove the center caps from the ralleys, but I figure it would be an easy way to switch the look around.
Thanks
Aaron