SATCOM, LSG,
Yes you're right, the 5 1/2" and shorter barreled SBHs use the standard grip (XR3-RED size) with round trigger guard and the XR-3 marking. LGS, the other markings you listed are the same size but alum. alloy.
I misunderstood what The Blackhawk Kid is looking for when he stated SBH grip and specified with the round guard. I thought he meant the SBH 'length' grip with round TG which would have to be the SBH Hunter grip and only comes in stainless. This one:
Sorry, my brain skipped a beat, my mistake.
SATCOM: yes, in general: All Ruger SA grip frames including SBH Dragoon, Old Army, Bisley and Birdshead (excluding Bearcats of course) will interchange from the standpoint of the screw pattern from Single Six to Super BH, Old Model to New Model, and even NM to OM.
Depending on models and vintage, some simple mods are required for NMs with free spin pawl/cylinder alignment, front frame projections, matching the grip frame 'ears' to main frame, and for trigger return spring on old model guns, or a few extra holes from old model grip frame to NM main frame.
The Dragoon grip with square back trigger guard filed off would end up with a gap. It's very square on the inside too. Flatgate has welded and rounded a few and they look very good and that way you get a carbon steel frame that can be blued with the regular process. But a lot of skilled work involved.