Phil's answer would be absolutely right for NEC4 but by reference to 63.3, I assume you are using NEC3 which is less explicit as there is no (equivalent) statement saying you use the "Accepted Programme current at the dividing date" as per clause 63.5 of NEC4.
However, contracts should be read as a whole and there is a reasonable argument for saying that, under NEC3 ECC, the criteria which divides forecast from actual in clause 63.1 also applies to 63.3 ... but it is a reasonable argument not a definitive one.
However, contracts should be read as a whole and there is a reasonable argument for saying that, under NEC3 ECC, the criteria which divides forecast from actual in clause 63.1 also applies to 63.3 ... but it is a reasonable argument not a definitive one.