Okay, there are lot of differences between that girl and Yukino, for example their height, the bow (that ties the hair) the color of the eye, the way their wear their uniform (there is a slight difference), the tone of voice...?, and that sweet and kind aura that Yukino has THAT NOBODY CAN REPLACE IT UWU
(yes everybody should know it, but only Nobora knows and her other friends too ofc what a shame)
pls don't take it serioulsy TwT