The WPC11 and WMP11 have internal photos on the FCC ID web site. I'm too lazy to lookup the FCC ID numbers. Bug me if you can't find them. Both the WPC11 and WMP11 have used that chip, but I don't know which hardware mutations. The FCC ID is different for these mutations, so a quick look at the internal photos should tell all.
There are also lots of Linux distributions that list the cards and what chips they use. See:
development. I would
Drivel: Petition with 16,000 signatures to get Broadcom to release internal info on the BCM4301.
Well, I tried the FCC ID search page for WMP11 and of course, it doesn't find anything. I correctly guessed that the prefix is "PKW". So, I used just "PKW" for the search key and got 70 hits. The WMP11 is listed twice:
Bummer. The internal photos shows a MiniPCI card, with an unreadable chip designation. The board says "Intersil" so I don't think it's a Broadcom chipset.
The one labelled WMP11-V27 is a bit more helpful.
It clearly shows the Broadcom chipset BCM4307KPF, which methinks (not sure) is a rather odd choice. It has an onboard V.92 modem and ethernet interface. Weird. Incidentally, the RF chip appears to be a BCM2051KML.