from the API perspective, there is no way to change the page key.
You could try to change it via the database directly, but there will be a few repercussions. Specifically, anywhere the page is mentioned will not be updated. The rest (history, comments, permissions, ..etc) should remain intact.
As to your second question, If you copy a page, the copy will not contain any history of the original, only the page content (and tags + files if you chose).
Let me know if you have more questions, or need help. Feel free to reach out directly at firstname.lastname@example.org
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