Both USB2.0 and 3.0 provide only 5V voltage, but USB3.0 provides slightly more current. The maximum output of USB2.0 is only 500mA, and the maximum output of USB3.0 is 900mA.
At present, no matter what version of flash charge, the minimum is 5V,2A or more, and you can output 9V, 12V voltage, which is not achieved by ordinary USB, so it can not be changed.
Of course, the normal USB port can not be replaced by a flash window,
Because the two sockets are different, they cannot be replaced.