Are JRA and MPT hydraulic booster cylinders the same?

Not the same.

Standard pneumatic-hydraulic booster cylinder belongs to the pre-pressurized booster cylinder, the Department of a hydraulic cylinder (pre-pressurized section) and supercharger (booster section) for the integrated combination of the use of compressed air as a power source, the use of the booster section of the size of the piston and the axial center (i.e., different pressurized cross-sectional area than the pressure is unchanged, when the pressurized area has to change from a large to a small time, then the pressure will be with the size of different changes), so as to achieve the effect of pressurization. ), so as to achieve the effect of pressurization.