CAHA engine swap

[rqx]

Hi all,about to start a swapping a CAHA 170 engine into my B8 A4 which was originally a CAG 120 engine and I have some questions
1.Does anyone know of any differences I may come across?
2.Will I need a ECU from a 170 engine or will I be able to remap the original 120 ECU?
3.Will I have to upgrade my clutch?
Thanks