The problem is the plastic case around the screen is shaped very differently (some have rounded corners others dont etc). And most screen protectors cover that as well and not just the actual screen area (it's maybe a 1-2mm region around the screen, which you see as "white border" when loading a completely black image). So the protectors don't necessarily fit even though it's technically the same screen size.
I don't use one myself though - I'm afraid it would diminish the screen quality, and so far I didn't have any issues with scratches on ereaders.
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