Most of my experience with this is with comic books rather than mixed text/illustrations, but I've seen different resolutions in the same kindle books depending on the download location. When they allowed downloads in the browser (for the transfer via USB option) those were different than the downloads in the kindle for PC app. The app downloads were lower resolution. I never had reason to copy from the Kindle to my PC, or from my ipad, but I wouldn't be shocked if those were different resolutions as well.
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