Shangaan, it makes 3/5th of **** all difference if the aircraft planned load is MZFW, only when the actual ZFW is arrived at can load control advise you of any changes.
Given that at both these stations I've often not received a ZFW until ETD-40 or later, achieving anything before that is simply a pipe dream, and in the case of NBO I've had a revision of ZFW above the max for the aircraft type, i.e 300 v 300ER