I thought that the Pearl e-ink displays are identical, whether in a Kindle or in a Sony, they're made by the same people. And one thing you can't do is make any adjustments to the brightness level of the background of the screen, it's just not possible.
If you're seeing one background as brighter than another, it's just an optical illusion caused by the darkness and thickness of the font used, which you can change on the Pearl e-ink screens. I actually don't see any difference in the background at all myself looking at the image. But to prove it, if you take the sample image and copy a section of the background only from the Sony and paste it onto the Kindle background area, you'll see they're identical.
Just change the font on the Sony, or at least adjust the viewing settings for the default, and the backgrounds should look pretty much the same.
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