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Form factor is similar. Brightness is better as stated. I believe you get better speakers in the Pro, the charger is higher wattage and the GPU in the high end air and Pro is 8 cores while the GPU on the base Air is 7 cores.

The Air is passively cooled, so the theory is it won't sustain higher workloads for as long as the Pro should be able to.

From what we know right now - same processor, different thermal envelope.

400 nits versus 500 nits brightness is another minor difference.

Higher sustained speeds, larger battery, brighter screen, better mic/speakers, Touch Bar.