walk cycle and run cycle on different frame lengths

I have a 16 frame run cycle and a 24 frame walk cycle. This is an issue because when I loop them, the run cycle disappears before the walk cycle finishes playing through. They're the same character using limbs from the same library so I can make changes to the same limbs in both cycles in real time. Is there any way to make each cycle into a symbol without hindering my ability to edit the parts of both cycles together so that I can just loop both from start to finish at the same time?