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According to the Intel® NUC6i7KYK Technical Product information, page#35
Headers and Connectors Shown are Front panel USB 3.0 header (1.25 mm pitch) (blue) and Internal Common IO header (1.25 mm pitch) (white)
I attach a picture of the Internal USB 3.0 Header information, hope this helps you.
USB.PNG 110.9 K