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I do only the epub. It's reflowable. I include the cover and save it as mybookD2D.epub and upload that to Draft2Digital, which takes care of the iBooks Store (or iBookstore or whatever Apple is calling it today) and several others. I then save the same epub as mybookKDP.epub and delete the cover and the associated image. I upload that version to the KDP and to Google Play.
I continue as if mybookD2D.epub were the only one. If I have changes to make, I make it to that version, then save it as ...KDP... etc and go through the same routine again.
Of course if I have to make significant changes, I make them also to the OpenOffice Writer document if (as is usually the case) there's also a print edition. So I do have to maintain two versions of the book in most cases, but never more than two.
I have found that making the same change in two versions of an epub is a recipe for making a mistake of omission or commission.
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