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DIGI2 Pro GPIO Pinouts

I'm building a Pi4B music server using the Pi 7" screen, with a PiSugar3 UPS on the bottom of the stack. The screen is powered from GPIO pins 2 and 6, but from the I've read from the HiFiBerry spec sheet that "GPIOs 5 and 6 are used for the clock circuit and cannot be used for anything else". Am I going to run into trouble sharing pin 6 for the screen, or should I use another ground pin.

Also, next to the GPIO there's a 5v power supply connector - is this power in or power out? 

 

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