Typically, more morning sun = more blooms so one of them may have more blooms than the other. Not sure if I could tell you exactly how much "more blooms" as I do not have two in those conditions myself. Then again, if the sun includes afternoon sun, a japonica there may get sunscorch on the leaves.

Both spots are still pretty shady but the one sunnier spot does get an hour of direct sunlight where the other gets more mixed sun during that time. I guess im looking to see if the sunnier plant will be FULL of flowers while the other will the halfway full, or will it be so minimal that you will not really tell that much. I can deal with it being slightly off, i just don't want one side blooming like crazy and the other just having a couple blooms. That may look odd. Both would be Sasanqua as well.

Well, as they say, you can try them and move them if you do not like the results. I generally do not have issues in more or less sun, I mean issues where I would notice less flowering in a large way. Best suggestion is to keep them potted for a season and move the pots if you decide you want to.

Ok that's good to hear and good suggestion.