Question Engine change 1.6 to 2.0 fsi



I would like to change the engine to an A3 8p to go from 1.6 to 2.0 fsi... the donor car is complete.

If anyone knows what problems could arise?

I guess that the motor supports are the same for the 2 types of motor?

And what should I change... engine+appendices, ECU, dashboard clock (as far as I know, it has the immobilizer on it, I suspect that if the ECU is changed, the clock, the key (the chip in the key) must also be installed...

Who knows, I'm waiting for some advice, guidance.