If I might make a suggestion - I learned the hard way when painting a room how much of an effect the surrounding or background colour makes to the perception of the interior colour of a patch of paint.
In my view - it's pretty unlikely if they are the same screen that they are selling batches with different specs. It's not impossible that some are faulty but I would expect B&N and Sony to get the same part.
I would however suggest taking a Sony and wrapping the border with something a similar colour and reflectivity to the new Nook and seeing then if there really is a difference. In my view the surround will make a difference to perceived contrast.
That opinion is worth exactly what you paid for it.
Best regards.
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