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The “twice as powerful” is almost certainly just about the GPU. The CPU is a U series part versus the HQ series part in the MBP.

The 8th gen U-series i7 in the SB2 is a quad-core, 8-thread beast with TDP-up of 25 watts, 8 MB cache and 4.2 GHz turbo.

Industry secret: apple throttles those cpu to 20W.

Source?

LOL. This very discussion on HN. And dozens of results after googling with 'apple cpu macbook pro TDP'.