It is possible for a pump to provide a higher pressure for the same flow rate, versus another pump.
In your case, I think that pressure is what'll be important, since you've got to get that coolant passed either the showerhead, or a nozzle. It would give your coolant a higher velocity as it goes down the bong, and it might help minimize the coolant loss.
Where did you get those specs? It looks like a difference in max pressure, between those two pumps, and not so much of GPH. i.e. the 3-MDQX-SC might give off more gph, but it probably reaches a height where it can't do anything, where the 3-MDQ-SC would still be going.
Hard to say, without seeing the curves.
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