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There is a detailed teardown here: https://www.chargerlab.com/teardown-of-apple-140w-usb-c-powe...

And a discussion here: https://discussions.apple.com/thread/256262949?sortBy=rank

And you will notice that the regular power adapter cable is not compatible with the new 140W charger: https://www.apple.com/au/shop/product/mw2n3x/a/power-adapter...