Probably that the control got some refrigeration. A lot of chocolate chip recipes call for an hour or so of chill time. It lets the flour get hydrated, firms up the fats, and that ends up controlling spread as well as giving improved texture

Control probably just refrigerated for one hour or so. Not sure how much difference it makes as i always chill it but i think i heard some people said the texture is different between non-refrigerated and refrigerated, and imo i can tell the difference between overnight and refrigerated for a few days, the latter is much more chewier.