I can. Octavia has a brown coat and dark brown mane, Blinkie (AKA Limestone Pie) has violet coat and light gray mane. And Photo Finish has a light blue coat and a white mane, and Inky (AKA Marble Pie) has gray coat and dark gray mane. Even reversing them their color schemes don't come even close.
This is a nice image. The Pie clan is often depicted as dysfunctional in one way or another. But that doesn't mean there were occasional moments of joy. I suspect such moments were few and far between, but not totally absent. Consider that Pinkie seems to need constant party stimulation just to function, so take her account with some reservation.