USP 45 is larger, but it depends on the holster. I have an Odin and JM custom IWB holster for my USP 45 and USP 9. The 9 would not fit in the 45 and vice a versa. I also have a Gcode OWB XST holster that fit both the 9 and 45.
USP slide in .45 is wider than the .40 version, on a leather holster you might get away with it, but don't think so with Kydex, there are not many CC holster options for the USP though.
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