Camera is not as sharp as another camera of the same model

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I currently am in possession of 2 Canon A650 cameras. I've been taking
some indoor photos with both of them today, and one of them seems to
have slightly sharper image quality than the other. I have made sure
that both cameras are using the same settings, and also used a tripod
with the timer shooting to make sure that I am taking the exact same
shots and also to ensure that I am not shaking the cameras.

I was going to sell one of them - it has some bad pixels on the LCD
whereas the other one does not, but the one with the bad pixels is the
one with the slightly sharper image quality. Can I somehow tweak the
other camera to have a sharper image?

You say "seems to", are they sharper or not?