The problem with turning the key in the ignition has nothing to do with the electronics, it is just a mechanical problem with the key blade. Either take it back or if I remember correctly you can remove a small roll pin and the old blade will come out of the old fob, you could then transfer it to the new fob.
BTW I have seen others capitalize "fob" like it is an abbreviation, what's up with that?
http://en.wikipedia.org/wiki/FOB_(shipping)
Keychain - Wikipedia, the free encyclopedia