That pictures shows the grips, the grips interchange. The grip frames between Old Models and New Models DO NOT INTERCHANGE. So a New Model XR3-RED grip frame WILL NOT FIT AN OLD ARMY. So no, "ANY" XR3-RED grip frame will not work, it must be an Old Model grip frame. New Model grip frames are setup for their long wire trigger return spring. Old Models and Old Armies have a coil spring and plunger right behind the trigger. Completely different, not interchangeable.
A New Model grip frame will not work on an Old Army without significant gunsmith modification. I DON'T KNOW HOW MUCH MORE CLEAR I CAN BE AND YES, I AM YELLING!!!!!!
A New Model grip frame will not work on an Old Army without significant gunsmith modification. I DON'T KNOW HOW MUCH MORE CLEAR I CAN BE AND YES, I AM YELLING!!!!!!