Talk:My Little Pony Equestria Girls/@comment-3146930-20130627031449/@comment-11159205-20130627032506

Alternate Pinkie Pie kind of addresses this point in the film.

Pinkie Pie: Oooh! I thought you didn't look familiar. Though, now that I'm really lookin' at you, do you have a twin sister who lives in the city, has a pet dog named Spike that looks just like that one?

I take it Canterlot High has extremely liberal rules.