Engine code/ speedo replacement

[Mark with a Fiesta]

Hello all,

not sure if this has been discussed before so please forgive me if it has.

I have an intermittent fault with my led odometer display. As i type this it is all working, but when i get in the car tomorrow morning it may not work at all and be completely blank or some of the digits may not display. My question is this:

If i change the instrument cluster does my engine code need to be the same as the car it has come off? Or can i simply swap the cluster regardless of the previous car’s engine code? Also, will my current odometer reading remain, or will it be for the car it’s removed from?

thank you in advance for any answers

Mark