Ereiam 
"[@Background Pony #B120":](/1146231#comment_4997867
)
Yep, you really need to stop the doom and gloom business because at this rate you'll get old before you're thirty.
(Honestly, it's not like that kind of thing would be possible in real life anyway)
If each Pinkie has picked to replace herself an "impostor" that is so close to her in the first place, that she took time to fill in with the intricacies of living in Ponyville/Canterlot High, complete with all the details about her circle of friends and the history she has with every single of them (I'm pretty sure they read each other's files and such), and that she trusts to do as good a job to maintain them as if she wasn't gone and to keep her informed about what they've been up to in her absence, I fail to see how their friends could feel betrayed if they weren't able to realize on their own that they've been dealing with an alternate version of their Pinkie half the time (it's not like she'd have been replaced by a changeling or a mirror pool clone).
At worst, Twilight might freak out for reasons related to the balance between words and using dimensional travel for such frivolous reasons, but we all know how Twilight is.
After the jig is up, I'm sure Pinkie's friends would actually be eager to get to know better the alternate version of their best friend and what actually separates her from the original.
Really, the worst kind of effect I can imagine about this is that the stress of maintaining a "double life" may eventually take its toll on both Pinkies, but I'm sure they'd be reasonable enough to stop before things go wrong, right?
...Oh, who am I kidding, we all know by now that "reasonable" and "Pinkie" don't belong in the same sentence.
You might be right after all, both worlds are doomed...
Monde de merde
Yep, you really need to stop the doom and gloom business because at this rate you'll get old before you're thirty.
(Honestly, it's not like that kind of thing would be possible in real life anyway)
If each Pinkie has picked to replace herself an "impostor" that is so close to her in the first place, that she took time to fill in with the intricacies of living in Ponyville/Canterlot High, complete with all the details about her circle of friends and the history she has with every single of them (I'm pretty sure they read each other's files and such), and that she trusts to do as good a job to maintain them as if she wasn't gone and to keep her informed about what they've been up to in her absence, I fail to see how their friends could feel betrayed if they weren't able to realize on their own that they've been dealing with an alternate version of their Pinkie half the time (it's not like she'd have been replaced by a changeling or a mirror pool clone).
At worst, Twilight might freak out for reasons related to the balance between words and using dimensional travel for such frivolous reasons, but we all know how Twilight is.
After the jig is up, I'm sure Pinkie's friends would actually be eager to get to know better the alternate version of their best friend and what actually separates her from the original.
Really, the worst kind of effect I can imagine about this is that the stress of maintaining a "double life" may eventually take its toll on both Pinkies, but I'm sure they'd be reasonable enough to stop before things go wrong, right?
...Oh, who am I kidding, we all know by now that "reasonable" and "Pinkie" don't belong in the same sentence.
You might be right after all, both worlds are doomed...