A print cover must be 300 dots per inch, and a "dot" is the same as a pixel. Assuming a book 5.5x8.5 inches, the jpeg for the front cover as uploaded to KDP Print Cover Creator should be 1687.5 pixels (well, make it 1688) by 2625 pixels.
That works fine for the ebook, too. Just trim off the 0.125 inch extra on the top, right side, and bottom of the image.
For purposes of KDP, a dot is a pixel is a dot.
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