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Fan, likely clock speed. And a different design.

The MBP gets all 8 GPU cores, the MBA gets 7 (but you can upgrade the MBA to get all 8 for effectively $50 with a $200 upgrade to the storage as well). Touchbar and bigger battery. I think those are the only differences

I think also "Studio Microphone Quality" - whatever that means.

That would seem to imply whatever quality it has resembles a studio microphone. It doesn't say 'Quality Studio Microphone' after all.

It reminds me of my recent purchase of an electric shaver. The front of the box proudly proclaimed 'WAHL: The Brand Professionals Use.'

It wasn't until I got home and started opening it that I saw a little bit of fine print on the side of the box: "not to be used in a professional capacity."

13 inch Pro has brighter screen I think, and that is noticable.

On the chip itself the only difference is probably binning

Yeah, that's what I was just looking at. Up to 2 more hours of battery life, TouchBar, and a [slightly?] better microphone is the only difference I can see. Not much price difference either.

Active cooling.