Only difference is FAB-500 M62 (labeled in original Mastercraft box as FAB250) and there is no labels for pylons in ICM box). I Mastercraft, no 21 is labeled as APU, actually is APU-73 Weapon Pylon. Kh-23 (As-7) in Mastercraft is actaully Kh-25 (AS-10 Karen) as stated in ICM box.