If Instagram is any indication—and, as far as we're concerned, it definitely is—Kourtney Kardashian and Kylie Jenner have been spending a lot of time together. Between working out together and taking selfies while wearing waist trainers, it seems like they're sharing style tips—Kourtney's once flowy and classic look has become very similar to Kylie's ~edgy~ one.

They've become so identical, in fact, that telling the difference between the two can be challenging. See for yourself—take the quiz below to find out if you can ID Kourtney from Kylie, based solely on outfit.