As stated above all flights between CPH/ARN/OSL- BKK/HKT are scheduled on 77W for W14. I would be surprised if this is changed as the concept of Y, Y+ and C will be difficult to implement of other aircrafts; if on e.g. 747 the number of C class seats will significantly reduced as there are only 9/10F seats and if on 777-200ER it will be difficult to accommodate C and Y+ pax with only 36 C seats and no separate C cabin for Y+.

IMO it will be rather safe to assume that actual a/c on the day of departure will be 77W.