1997 Rover 2 Series

1997 Rover 2 Series V12 Manual

In my car was brocken in recently - door lock is damaged, if I just buy another door lock from the scrap yard and fix it instead of brocken one - will it disarm the central lock sistem or immobiliser? If not - would I be able to enter the code for immobiliser with the new key? Considering I ll have two - one for the door one for the ignition. I m short of money to afford a proper repaire.
Thank you