I suppose with creative plumbing you could rig 1 pump for both pools. But here's the problem, You're still filtering ALL of the water in both pools. Running (for example) 1 pump for 8 hours instead of two pumps for 4 hours (or 2 and 6) probably won't save you any electricity costs. You may save money on the price of the second pump, but you still need a filter big enough to handle the total water volume. Look into some High Rate filters for your total estimated water volume, which kinda sounds a little under estimated to me.

Hope this helps. BTDG