If you purchase both a KDP and IS cover, you’ll notice the colors may look a little different from each other. That’s normal. In my experience, KDP prefers covers to be uploaded in the RGB color scale even though they’ll convert it into CMYK at the printer. IS, however, requires the CMYK color scale for you to upload your cover. Please see the question about RGB/CMYK color scales Why do the colors in my printed paperback wrap look different than the colors in the digital files? for more information.