Twins of a Different Better Sort...

Last week we featured identical twins, this week it looks more fraternal or whatever they are called when they only sorta look alike. It seems a bit much to He, but for some reason this seems to happen whenever girls hang out together too much.
The Hair is exactly the same, down to the little clip holding it back.
The bags are identical, except for the color pattern.
Jackets a jacket, but they look the same.
Both in black leggings, no complaints.
Boots, both in black wedge knee high boots, but clearly the girl on the left has higher sexier better boots.

Why is it that we find girls tending towards each other, same cycle, the more they hang out?
-He