According the ingredient on the package, it is the same dosage as GC. Using GC with Copper Power is fine as long as you add some O2 to offset all the meds in the water. A powerhead aimed up at the surface so it's actively rippling the water's surface does the job. Can also add a bubble filter to help a bit more.
The dosage method on the package is pretty close. Usually dose, wait 5-7 days and then do a 25% water change. Dose again, wait 5-7 days and then do a 25% water change. And then observe for 10 days or so as we have seen some prazi resistant flukes lately.