For the OP.
As shown,, there are substantial differences in the models.
The Redhawk is a Large framed Double action (DA) revolver.
The Blackhawk is a large frame Single-action (SA) revolver.
The GP-100 would be more of a medium framed DA revolver. It's smaller than the Redhawk,,, but still bigger than the SP-101.
The SP-101 (I'm not sure if there's a model GP-101) is the small framed DA revolver.
Now,, the picture shown is the Super GP-100 in 9mm. It was a Custom Shop,, 8-shot DA revolver built for competition. They have dropped the 9mm, but they still offer a .357 in it. I'd have to actually measure things,, but I THINK the Super GP-100 is on the normal sized GP frame. I may be wrong.
Richard76; "I agree, never heard of Ruger making a super GP100. unusual frame and caliber for it"
As noted,, yes,, they make a Super GP-100 and the one shown above is 9mm. It was built before the covid crap,, and not picked back up yet. As I've mentioned,, a Custom Shop gun. Look at the serial number of the pictured gun. CS6-00073. And it's marked 9mm on the barrel shroud. The concept for that one is speed competition games such as ICORE & USPSA.