There is always going to be some variation, either good or bad, small or large, with seedlings. Since they're pretty well sour as hell, I don't think it's going to be that important. Sort of like pitangatuba. Yeah, maybe one is 1-2 brix better and you classify it as "sweet" , but anyone else unfamiliar would be puckered up for an hour and kind of mad at you for serving them one.
Both my seedling plants have grown baseball sized fruits, just they didn't complete cause it was too cold / rainy here.