Hi Rem,
The plans were really designed as single-sport training plans. From a training load perspective, they really aren’t designed to be paired up, especially not with each other. A good multisport plan takes into account training load from the other sports. But these plans aren’t designed in that way. I couldn’t in good conscience recommend that you were to do both plans simultaneously. Both plans you mention are on the more taxing end of the spectrum. Neither plan was designed for a multi-sport athlete, but should you want to incorporate some cycling, I’d recommend something on the lower intensity end of the spectrum while you’re in the midst of the 13.1 running plan.
Ride On,
Jordan
Zwift Design