Maximum ratings. The rectifier's diodes can handle a reverse voltage of 200V, 100V, whatever. The circuitry downstream from the rectifier can not draw more than 35A, or whatever.
So the rectifier's input must not exceed its rated voltage, and the circuitry connected to it must not exceed its rated current.
The voltages you are measuring at the output are from the input voltage minus diode drops +/- some ripple. The other rated rectifier would work the same at the voltages you're working with.