Answered: NEC ECC: Assessing Compensation Event: additions and omissions

The contract, and more specifically clause 63.1, is quite clear :
The change in the Prices due tot he effect of the co pension event = change in Defined Cost + Fee.

Defined Cost + Fee (under NEC3, options A&B) = Shorter Schedule of Cost Components + Fee.

Therefore, you use the Schedule of Cost Components to assess the change in costs (although by agreement, you can use rates and lump sums as a basis).