I would date those Presentation-style grips as approx. the late 70s. They are well-shaped as is customary of earlier Pachs. Later generations of Pach Presentation grips are more blocky in shape and do not fit the revolver frames as closely. Also, these grips are two-piece; many later Pach grips are connected at the rear.

These square-butt grips will fit on a round-butt grip frame: the pin at the base of the frame will fit into a corresponding recess in the grip. As the previous poster said, there may be a slight bit of looseness. On a .22RF, it should matter very little.

Kaaskop49
Shield #5103