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If they can, I'm not one of the people who knows how to do it. Admins MIGHT be able to... but I don't think there's a way for regular mods and smods to see what was edited out of a post.
No they can't. A feature like that would most likely use a lot of space.
If a post is reported though, the mods will see the content of the post the time it's been reported, meaning that if someone edits it afterwards, mods will see the older version.