The short barreled SBH's (4 5/8" & 5 1/2") have the XR3-RED profile grip frame on them. Although it is steel, it is the same size as the regular aluminum Blackhawk grip frame. So the grips will interchange between the two guns.
The long barreled SBH's (7 1/2" & 10 1/2") have the larger square back trigger guard dragoon style grip frames on them. These grips will interchange with the Hunter model guns which have the same grip frame on them but this one has the regular round back trigger guard.
Confusing ain't it?