The amount you turn the wheel is identical [0] with or without power steering, unless perhaps you have one of the weird variable turn ratio systems. In a conventional power steering system, the steering wheel is linked to the wheels, and the power steering applies torque to help you turn the wheel but does not change the relationship between the steering wheel and the wheels.

[0] Almost identical. The steering has some flex, and the amount it flexes is related to how much torque you apply. But this is a tiny effect.