Pumping vs Jelqing.Same thing?

I am about done with my first month of PEing (Modest routine: Extender 6 hrs a day, Jelq 160x (2 days on 1 off) and I have started to wonder, would pumping not bring the same results as Jelqing?

In my observation they seem to both allow the extra bloodflow to the corpora cavernosa and glands that is needed to grow/stretch. What would be wrong with my observation?