At operating temps (above 80C)...
Power Steering Pump Spec - Minimum pressure @ 1000rpm 75kg/cm^2 or 1067psi!
Fan Pump Spec - Oil pressure @ Idle with Fan At 1100rpm is 12-25kg/cm^2 or 171-356psi
Dunno flow rates though. And yeah they do look very similar inside but the pressures are way different.