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Print book have '2 printing plates made' (the plate may have multiple books or multiple pages that make up a 'signature'. And that is for Black print only) for each (really big) sheet of paper that passes thru the press.
That is a lot a plates to change, so the don't (and the don't keep the plates after the run. In the old days, plates were created by using film negatives. They did not keep those either in many cases).
EPUB can (and usually) gets totally reset, Corrections at any time and the Author does not have a Page count Limit/target, so they may include all the source material that the publisher trimmed.
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