@FrankTuna is the stack height the same between the two pedal bodies? Did you adjust your saddle height accordingly? If not, then this change may be the result of the change in distance from saddle to pedals.
You’re also comparing rides with different crank lengths, which is probably contributing in some way, too.
While it does look like a big change, I wouldn’t worry about it too much.
I can’t remember if you typically focus on lifting legs during the off season, but if you do then recommend adding in some single leg work to force your body to even out leg strength. I (generally) follow the FasCat 10-Week Weight Lifting Program but do everything single-leg. It’s taken a while but I’ve seen my L/R balance trend more evenly by a couple of % points.