Figuring out the power usage of these 2 PC's?

No way to tell you since neither of the pages list the specifications of the AC adapter. If you can find those then you can use the formula P = I*V, where P is power in watts, I is current in amperes and V is voltage in volts. You can get the values of I and V from the specifications of the AC adapter. Make sure to use the input values for the AC adapter and not the output values.