What components to swap from broken iPhone 6S logic board to a donor

I bought a cracked/bent Iphone 6S Unlocked GSM phone off someone who told me for certain the crack didn't effect the logic board. Well sure enough I crack it open and the logic board is snapped right under the SIM card.

So my question is if I bought a donor logic board off ebay with an icloud lock, what components/chips would I have to swap to make it LIKE the messed up phone I got.

I'm assuming if I knew what pieces store the IMEI information on the board and I swapped them, then it would make that 'new' logic board unlocked as well?

...BUT... if I did that would it also remove the icloud lock that was on that donor board? or is that on another separate component?

and lastly if the donor board has a lower GB storage than the broken unlocked phone, is it possible to swap that chip out without complications?

thanks in advance.