Hope this helps, as far as I can tell they are the same width. It seem that it is only the profile contour that is different. The height is also not that different although the USP slide is taller by about maybe a 1/16. By the way-L to R is a USP T 45, HK45C, USP .40, P30 9MM
If anyone else is looking at these, can someone tell me what the letter code on the undeside of the slide is? the one on the loop for the guide rod???