Same model, different size?

[grandaddy71]

I have two H&R model #732 pistols one is larger than the other. My question is why are they the same model number? The third is a 733 at least its got the same size grip as the larger 732. Don't get me wrong as I like all 3 pistols.

 

[WIL TERRY]

THE frames are ALL the same size.
The BBL's vary in length.
THE gripframes might vary a bit as they made two or three sizes for different stock sizes.
H&R used that frame size since Moses was a Corporal.
ALL THE SAME !!
And this includes guns in 32S&W, 32S&W long, 38S&W, 22SHORT, and 22LR.