So I read this really quite enjoyable Flutterdash fic on an alt account a while ago. It was about 2 versions of Fluttershy getting swapped between universes, the one we know and love and the one from an alternate dimension where Rainbow and Shy's personalities and stories have been swapped. I can't remember the name of it for the life of me, so if you know, could you tell me please?

I think it was this one, Two Hearts Fall Apart.

https://www.fimfiction.net/story/114194/two-hearts-fall-apart

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It is indeed! Thanks for the help!