I'd say there is no way that those are the same fonts being displayed (look at the lower case "L"). Have you tried a different book on the Aura or even changing to a different font and back again? After updating the reader seems to need to have font reselected to actually take effect (even though it shows the proper name in the selection box). Should be something simple like that rather than that big of difference in the rendering. I'm assuming they are both kepubs or epubs (i.e. same on both?).
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