I'm comparing an original to a hi-res pic from SHOT. The differences that I find most noticeable are the shape of the stirrup cuts on the slide; the repro having "ball cuts" when the original has a profile more like the M1911A1 slide.
The relationship of the frame tang that encloses the hammer, and the grip safety, looks "different"; the grip safety extends further to the rear, or the frame is shorter on the repro? It makes the rear of the grip frame looker bulkier and not as slender/sleek.
The frame contours around the trigger are a little different. On the repro, it looks like the frame has an extra radius around the trigger, when the original has a straight vertical line joining a single radius that transitions into a horizontal line, without the small "steps".
Exactly my observations, too.
Close, but no cigar.