Changing the Common App essay

<p>The Common App allows you to unlock the essay two times to make revisions, but it states that you can only make grammatical/minor edits. I have submitted my application for one school already, and have written a much better essay in the meantime that I want to use. However, it works a lot better with a different prompt, so I am wondering if schools allow you to change the prompt, seeing that I am allowed to when i unlock the essay. Basically, when it says that you can have three versions of your common app essay, does that mean that they can be separate prompts too?</p>