In a nutshell...
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Well, the dimensions are slightly different, but the .44 Ann I don't THINK is the same size as the .45 Colt.
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The standard .45 Colt BH is the same size. The .45 Colt 'flattop' is not as it is on the medium frame.
First, all '.44 Mag' revolvers are on the large frame from '56 to present. Some are flattops and some have the 'ears', but all are on the large frame -- Old Model and New Model. Note, Ruger did try to put the .44 Mag on the medium frame at first, but proof loads showed a slight problem -- the cylinders blew. Hence the large frame.
Keeping that in mind, all New Model Blackhawks ('72 to present) and Super Blackhawks are on the same large cylinder frame. This includes the .357, .41 Mag, .44 Mag, and .45 Colt ... fluted/unfluted cylinders, the Bisley, the Hunter, and original Vaqueros. Exception is the .357 Maximum Blackhawk which has an 'extended' large frame and cylinder.
The Old Model .357 was on the medium frame. Many of these were turned into .44 Special revolvers by gunsmiths. Along came the flattop New Model Anniversary .357 in 2005 on the medium frame. Could it happen? Yep it did! Lipsey made a special run of .44 Special flattops (finally!), and then the .45 Colt/.45 ACP (Yes, a must have!) which the OP is wanting. Finally Lipsey did a special run of .357/9mm as well on the medium frame (alright!) in the 5 1/2" barrel length. Also, the New Vaqueros are on the same medium frame -- just have fixed sights.
Anyway, just a brief incomplete history of Ruger SA revolvers...
Note I talk about the 'cylinder frame' above. There are a several different 'grip frames' that match up to the large and medium frames. Hammers, triggers, ejector housings etc.... Another subject to make it more confusing!