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Performance should be the same (same architecture and transistor count), but because of the smaller node used by Samsung, the A9 produced by them should a little cooler than the TSMC one.
Spotting which one is from TSMC or Samsung could be pretty difficult, since the temperature difference between chips could be less than 1-2 degrees.
Further investigation should be made with a X-ray microscope, the see the real differences between both manufacturers.
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