You are not giving me some real technical data above, number of shots depends on so many things - it's not an accurate measurement.
I guess you don't have a discharger which can show you real discharge time of this type of battery, but here is a fast and simple test:
Shoot with original battery and the magic one while the camera turns off and shows message "Change the batteries".
Put the Canon battery in the original charger and measure the time until the battery is charged.
Put the magic battery in the original charger and measure the time until the battery is charged.
In this case you will have the same input (mine says 0.54A) and depends on capacity when the batteries will be charged
The other easy thing you can do is to check the weight:
"A significant part of the weight in a LiIon battery is Lithium metal. Two batteries of the same nominal capacity should have similar weights.
I'd guesstimate that a 10% difference may be due to happenstance and construction, but beyond that I'd be suspicious.
In larger & heavier batteries this test will work better than for very small batteries."