BTW I sometimes front pocket carry the Model 60, although the 642 is more convenient and ends up in my pocket more often. Both are stock, i.e. extended grips on the 60 and boot grips on the 642. The grips are the biggest difference, and can be swapped for under 20 bucks. If I didn't have the 642, I might get a second set for the 60. I do shoot .357 in it, though, and the longer grips make that easy to do, so I would keep them.
With a Desantis Nemesis, the hammer has never been a problem for pocket carry.
One way or another, having one of these guns has never made me want to get rid of the other. With .357 and snake loads, the Model 60 is a great, unobtrusive trail gun in a little belt holster -- but I really do like that 642. It's just more of a special-purpose revolver.