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I'd only worry about ISBN when publishing, or if running a bookshop. They are annoying in a library system as different ISBNs sometimes have EXACTLY the same content and it's only the size of the book, paperback, hardback and ebook versions, all of which MUST have a different ISBN, because the 13 digit ones are ALSO UPC/IPC for retail sales.
A different ISBN doesn't tell you on it's own if it's a revised version, only metadata in a database or looking at copyright page tells you that.
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