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There certainly is a subjective difference, since different devices use different fonts; eg the Kindle 2 uses "lighter" fonts than the CyBook devices do, which makes a difference to the contrast. But there really is no difference in the actual background of the screens.
There is a difference if you go back to the PRS-500, with its first generation eInk screen. Those screens had a darker background than the current 2nd gen screens do.
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