What is the relationship between the hydraulic pressure and the pressure placed on the concrete. Say your pump is is plugged up and is at max pressure, say 300 Bar.  How much pressure is being placed on the concrete? Is there a difference if the differential cylinders are set on the rod or piston side?

The difference is the relative size of both pistons. Do you want the formula? Or an explination?

300 bar X 14(equivalent of bar X atmosphere) divided by 10 X.985 (equivalent of 10\" pistons X pi variant) =413.7 psi.