So....late night wandering led me to Un'goro Crater. King Mosh happened to be up. I then ran into the Devilsaur Queen and started wondering which one was bigger, since I couldn't tell. Teigan and Jade suggested that I kite Mosh south to find out.
Done and done.
After much fearing and screenshotting, I finally got Mosh to his queen. It appeared that he was the bigger, but not by much! (He's usually the one on the left, the highlighted one at all times.)
Ahhh, devilsaur spam.