In a word... No. Bummer
The USP .40 uses polymer mags, while the Compact uses metal mag bodies that are much slimmer. This is about the only complaint I've ever had about these guns (I have both, no finer fighting pistols made for under 4 figures, IMHO). The upside is, the thin mags in the compact make for a double stack mag that fits in a grip the feels smaller to me than a 1911.
DanO