I think it might have been a 1911. But I can’t really remember…
I strongly suspect that the grip frame is the same, considering that it is using an aftermarket Hogue grip. Looks to me like the difference is thinning the new version around the cylinder window, eg, the top strap; possibly the cylinder window length—all the fire control parts still have to fit in the ass end. I suppose we shall see. History has shown me to be sort of that way.