Yes but since each card has a different MAC (Media Access Control) address they will look like what they are, different cards. As long as the card works, I.E. actually is a good card, there should be no need to reinstall the drivers. You will need to setup the connection again for the #2 card but once that is done you can use either card in any of the PCs.

I just did this with 2 of my notebooks. I have 2 Dell TM1300 cards, 1 a MiniPCI card and the other a PC slot card. I bought a new Dell (TM) wireless 1350 MiniPCI card and replaced the TM1300 in my i8200 with the 1350 card. Then I installed the TM1300 MiniPCI card in my C610.  In both cases I did not need to install the drivers again because they were already there. I did need to setup the connection again with my WPA key.

OK, I understand about the different MAC addresses for each device and how they are unique.  I did try to setup the connection for #2 but card #2 couldn't even detect my wireless signal (see my notes).  I'm wondering if it has to do with the pcmcia slots themselves and how the devices installed.  This is my experience when I purchased card #1 and didn't even considered buying card #2:

I have 3 laptops that shared card #1,  When I installed card #1 for each laptop I installled them in the bottom slot for each and they worked on each laptop.  I noticed when I inserted card #1 into the top slot on each laptop New Hardware detected was invoked.  I didn't think New Hardware would be invoked just because I inserted it into the top slot but it did; so I continue and let windows do it's job looking for the driver; and it does and the device works without having to setup a connection because it's already there.  You would think you wouldn't have to care which slot you inserted the card right?

This is making me think that I should install card #2 in the top slot since the bottom slot was installed with card #1 (I haven't tried this yet) and that some how windows, software/hardware and the mac address is tied to the bottom slot. In your situation you have 1 pci card and 1 pcmcia card, maybe this makes a difference?

If when you insert the card you don't get the new hardware found wizard and/or the little icon in the notification area telling you there's new hardware then I'd say the card is bad. If this happens on all 3 of the PCs then I know the card is bad.

But I do get New Hardware found for card #2.

I un-installed card # 1 from device manager and the remove the card's software from Add/Remove programs and installed card #2 and it works flawlessly  on 1 laptop anyways.  This isn't my issue.  I want to able able to use card # or card #2 on any slot on any laptop.

Are you using DHCP to assign your IP addresses dynamically? IP addresses are set and used in the TCP/IP suite, it should be a level above the wireless hardware. It should automatically renew once you turn your computer back on, after installing the new card. Are you broadcasting your SSID? If you are, the wireless should at least pick it up. If your not, you won't see it. I don't broadcast mine, so my laptop won't show the wireless network as available unless it connects.

Mike.