No, it looks like a mini-PCI card, but it is different.
From Google:
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I got my AirPort Extreme card in the mail today. The news is not good. The interface does not look a thing like the mini PCI interface on the WMP-11
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Remember that the Apple device is mini-PCI. Electrically there is absolutely no difference whatsoever between true mini-PCI and regular PCI. It's all just wiring.
Apple's Airport Extreme module isn't true mini-PCI, but I would not be at all surprised if all they did was rearrange some of the pins and remove some of the unnecessary ones.
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I took apart my WMP11 card today. Sure enough, it's a mini-PCI adapter with a miniPCI card. However, now that I've got it taken apart, the bus interface doesn't look very much like the one on the picture of the Airport Extreme card you can see on Apple's site.