Should tire pressure be equalized or slightly offset?
Tires usually have a inflation pressure range, or maximum pressure specification rather than ab absolute recommended pressure. The pressure you should be using depends on how much you weigh, the surfaces you are riding on and your preference for ride comfort.

Unfortunately there is no way to definitely determine what you tire optimum tire pressure should be, but you can experiment with different pressures.

Similarly there does not seem to be any definite guidance for different front and rear pressure other than the front should be a little lower because most riders have a rear weight distribution bias. 

Personally, I ride a drop bar bike with a moderately relaxed position so I run the front about 10-15% lower than the rear.