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The UUID is always a UUID of type 4. i.e. it has a fixed format.
An ASIN is basically a 10 char ISBN, but with the restirctions to make it a valid ISBN removed.
I'd suggest if it is a 10 char strin to assume it's an ASIN otherwise not.
Though I dont recall if Amazon also prefixes the data in the ASIN fields with BOOK or something like that
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