A160 auto gear select unit replacement

[KW27]

I have a friend with an A160 - A168 that has locked in park mode and I have extracted the Auto Gear Select unit and wonder if it could be directly replaced by the A1693700509 unit from an A169? I know where there is one that is basically new (only 4000 miles) and can be had for a good price. The A168 units are obviously old, not too reliable and getting very expensive. I don't really want to go down the breakers route if I don't have to, but equally my friend does not want to pay the price of buying a unit new from Mercedes if he doesn't have to. Any assistance would be most gratefully received.