Greetings Derek,
Chances are, they will not fit without quite a bit of modification. For one thing, USFA places their grip retainer pin (that little cross pin in the grip frame) in a slightly different location than Colt. That problem aside, finding grips that will fit one gun to another can be a real crap shoot. I have 3rd generation Colt grips from one gun that won't fit on another 3rd gen. Colt. This is also true with my USFA's. I have tried interchanging USFA grips and they just won't fit right.
CJF