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For what it may be worth, I created an empty book in calibre, added the title, author and ASIN for the Kindle edition. The cover download showed the same size for Apple Books, Amazon and Kobo. I downloaded all 3 files and they looked identical and had the same jpeg setup other than a minor difference in the number of colours. I sent the cover images to my Kobo Libra Color and they looked identical to my naked eye.
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