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A lot of the published "possible reasons why the K4, K3 screens may be different" are not based on proper scientific testing methodology, and do not take physical properties of the basic technology into account.
You need to do a little REAL research, instead of taking perceptual differences (graphite bezel vs. silver bezel), flawed testing (kindles not compared at proper temperature, voltage, and display "exercise" to reduce oil viscosity), potentially incorrect camera settings (failure to disable auto iris, auto white balance, auto exposure time, etc.), and biased personal opinion as "evidence" in your decision making process. There is plenty of documentation "out there" about which type of eInk technology is used in kindle displays, and how that technology works. More details (such as eInk calibration) may be found by reading the GPL source code for the eInk drivers, and by looking up part numbers of the chips used to control the eInk displays in the kindles. I have done all of these things.
Be very careful what "evidence" you use to form your opinions and make your decisions about kindle eInk display quality. We do not need more "junk science".
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