remb1000

Hello, im in a bit of a situation!!!
I have a peugeot 406 hdi model, year 2000.
Thing is I need to put a new ignition barrell and key into it, (including transponder, wiring etc..) up as far as the ecu I believe?
My main concern being is that if I get a replacement ignition barrell, swtich, transponder etc... from another peugeot 406 hdi of the same year.
Will this in turn hook up to my car without any problems, and will it register with its ecu???
Or will my ecu need to br programmed by a peugeot dealer to regonize the new key and barrell once installed of course???
If anyone has any suggestions please help, as I am finding it hard to obtain information on this matter. Thanks