I'm pretty sure this one is by far, the best "which one's the real one" moment.
Cherry's expression says it all
We must concoct an elaborate and convoluted test to figure it out! Dizzy knows herself better than anypony, I'm sure she can think of something.
Uhhhh.......The Dizzy Twister asking who's real, maybe.......
Then Cherry dope slaps Dizzy Twister ,
Gee, I wonder who it is...
Reminds of Pinkie Pie, when she isn't sure if she's the real Pinkie Pie.
It's a mystery!