Power steering and NATS

Ive recently sourced a power steering column with motor and key to replace the faulty one on my daughters. I know I need it reprogramming but is there a way round this? What if I got the ecu from donor car also or is there something else I would need? Where is immoboliser or is that part of ecu?
 
The EPS has a dongle that is learnt to the BCM on first ignition on, cannot be changed. This is an old post but can help if you still have the issue.
 
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