Planning on booking a return F award ICN - ZRH for this winter. Since the flights to Zurich in December are expected to be operated by a 777-200ER, the difference from Prestige to First are significant.

HOWEVER, KE swapped last minute most of this summer's operations to Zurich to a 789-9, so I wouldn't be surprised if it happens again, especially that it's a 789 again from January.

If it does end up being a 789-9, with the same Prestige and First seats, would KE accept changing my booking to Prestige?