If ~3.3v is connected to a GPIO set as output, would it damage anything?

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If the gpio is at logic 1 it is already at 3V3 so there will be no difference.

If the gpio is at logic 0 it is at ground and connecting 3V3 will in effect be a short-circuit. That can kill the gpio and or bank of gpios and or the Pi (unless an appropriate current limiting resistor is in place).

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