tranplanted parts

[harj81]

hey guys

asking a question on behalf of a mate of mine
he has an a2 1.4 tdi which was burned inside, he bought a cat c a2 for parts and has done what he needed to,

there are 2 things tho, the scrap car has rear electric windows, can he just swap the motors door cards etc and plug in? or will the whole wiring loom need to be swapped?

the other thing is the scrap car has an upgraded symphony 11 stereo can this just be plugged into his car?

thanks