No, you don't need to for display swap.
You need to do it if you want to swap PCB and your new PCB came from a car that does not have the rotary control.
All is well now
I managed to fry some RS4 clocks, and I fixed them using a PCB from an A6.
Curiously enough the A6 PCB was donated by ddillenger, and I received it after he had passed away. Oh well.