Well, the several pressure measuring methods are not translateable, one into another by simple means; many are not correlatable at all. The problems arise because the pressure methods are very different. Some give a measurement more like an average and some give a measurment that reflects more like a true peak. It is just like the difference between the old psig and psia measurements, but more complicated than that. In additon, the places on the case where the measurement is taken, are different and affect the readings, too. All of the measurements are greatly affected by the measuring tool, too.
Best bet: max is max in any system, just as others have written here.