@flat pancake  
“yes but witch pink one?”

“both”

“Isn’t it obvious? I’m Pinkie Pie. No Multiverse Theory will change that.”

Maybe she should good deeper…
 
To see her earlier memories.

@Background Pony #A3CC  
Is this a reference to something?

Daydream Shimmer: How do you know you are the Pinkie of this universe?
 
Human Pinkie pie: That’s easy! Ask me something that the Pinkie of your universe wouldn’t know!
 
Daydream Shimmer: That’s harder than it sounds…let’s see…what are cupcakes made of?
 
Human Pinkie Pie grimaces as her expression turn serious and pensieve
 
Human Pinkie Pie: Quarreling. Bad decisions. Bad company. Rebelling against things not worth revelling against. Reunions. A family shattered…and then put back together.
 
Daydream Shimmer: Fair enough, you are this universe’s Pinkie.

“I’m Pinkie. You really can’t tell?”

I still say that’s not just a blooper. It would explain so much about Pinkie’s ‘guesses’.

“Silly Sunset, I’m the pink one obviously.”

@Background Pony #15FB  
Some Pinkie Pies are more Pinkie Pie than others.

@PonyPon  
It’s Pinkie Pie. Enough said.

@Shepherd  
“Evidently, more than you think.”

Pinkie “Does it really matter?”