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@Cambridgeport90 Probably not worthwhile. @OpenLibrary may shed more light on their ID, but it's likely proprietary. ISBN is an ISO standard and broadly supported everywhere.
Related details see:
https://www.wikidata.org/wiki/Property:P648
http://www.dlib.org/dlib/january04/vitiello/01vitiello.html
https://journal.code4lib.org/articles/8715