From the pictures, it actually looks like the Sony has the lighter background. Did you try adjusting the brightness/contrast on the Sony? That will show a remarkable difference compared to default. Also change the default font to something better, I think generally Amasis is considered quite good by T1 users so far. Sony's default font isn't as good as Kindle's Caecilia font.
But the screens are identical e-ink. It's possible to get variations though between screens, even from the same manufacturer, it's just the luck of the draw. I have 2 PRS-350s and the 2nd one I bought is noticeably brighter with better contrast. Not that the first one isn't still a pure joy to read from, just the variations you can encounter. Someone else having both the 650 and T1 might have a brighter T1 compared to their Kindle.
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