The Era has, as you mentioned flush display design where a plastic or polymer layer is applied over the actual e-ink screen to make it flush.
Because of this, it is not surprising that the display looks slightly faded (more grayish instead of black) or slightly less sharp, because the extra plastic layer has certain light refracting properties (it blocks a bit more light, resulting in a darker look or feel)
The first image (without light) look almost identical to me, the deviation - assuming the e-ink screen is identical - is minimal and presumably fall within tolerance limits. No screen is 100% identical.
Personal preferences and ease of use should be the deciding factors.
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