Same as someone mentioned above, the contour of the built up pallets, especially the Q7 or shelf pallets, which the height is between 96inch and 118inch, would be different on B77F and B74F, due to the curve of the cargo compartment. For instance, you can build 18 cbm loose cargo on a Q7/shelf pallet on B74F but have to load less cargo on B77F.
Cheers/Fire