I don't think they're the same size keyswitches. I bought some new platinum IIe keyboards (the extended ones with the number pad) to use for just that purpose and found that the keyswitches are not quite the same.
On the other hand, I mentioned this on the Classic Computer email list and someone said that it could work. He said he drilled new holes in the keyboard PCB for the tabs from the IIe keyswitch (spacing is a little wider than the original) and then just connected the tabs up to the original traces on the board and it worked great.
So the IIe switches might work, but it might take a bit of hackery to do it. I haven't tried it out myself yet. It would be nice to find some use for those IIe keyboards. I've offered them for sale a few times, but IIe owners all seem to have working keyboards.
