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It's the separately uploaded cover that KDP uses. Typically I use 2144 x 2860 for epub2 upload to KDP. The dpi is meaningless as a screen can be 4" to 19" (a Kindle app), or 6" at two resolutions for smaller Kindles.
Paper uses 300 dpi MINIMUM, and can use more. For paper you separately upload the correct size for the physical size of cover, at 300 dpi, typically. Though you might use 400 dpi. Depends who is doing the POD. Also I'd not use ANYONE'S cover creator. When you upload a PDF for POD paper, or even a print run, the company should tell you the over all front, spine and back dimension based on number of pages and paper thickness and you upload a single image for that. You decide on a paper print size before PDF creation.
Amazon recently launched the idea of creating the paper edition and ebook from one upload. It's crazy. Paper books have headers, footers, different margin rules, different needs for internal images. Often different front and rear matter. Possibly different fonts not suitable in an ebook.
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