This is my unintentionally almost matched set that I recently wound up with. I found the model 66 in a pawn shop run by a friend about two years ago. It is a retired police sidearm, and the officer put the Pachmayr grips on it.
Last week at a local gun show I found the model 63. I really like it because it has the red ramp which is a personal favorite. I want to use it as a snake gun for deer hunting, and possibly for small game hunting. So I found the target-style Pachmayrs to keep on it for use in the field. It was only after I put them on that I realized how much like the 66 it looked. Really cool that they are like big brother/ little brother!