Can you interchange a FC7710 Octalink drive side crank arm with a FC7701 Octalink crank
The FC7703 triple crankset uses an Octalink 118.5mm bottom bracket
The FC7710 track crankset uses an Octalink 110mm bottom bracket
If you want to use the track crankset, you would need to change the bottom bracket to the correct one.
PDF for triple crankset
PDF for triple bottom bracket