1 - The screens, to my eye, look very similar with the 2019 being less white (with brightness and warmth turned all the way down). The 2019 text looks slightly crisper but it could be my imagination. They are both great screens. The 2019 is much easier on the eyes for night reading for me.
2 - My experience is that 3rd party cases that worked with the O2 don't work with the auto sleep and wake functions but fit otherwise and magnetically connect to the O3.
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