Probably none.. just unprecise specs given by the manufacturer. As an example, if you have a 50 ohm output but don't load it at all with a terminator, you may have 3.3Vpp. But if you attach a 50 Ohms termination, the signal will be reduced to 50% just because of the resistive divider (50 Ohms in the source, 50 Ohms in the termination). So you end up with 1.65Vpp.
Next: what does the 32mA setting actually mean? We don't know, it could be just an internal current setting. 32mA vs. 16mA should be 6dB in power level.. it is not.
Output power level (measured at 10MHz, fundamental power channel):
Fundamental power level means although you have a square wave they only quote the power in the 10 MHz component, not in all the harmonics. So again something to be corrected for. Why do they quote it that way? Unknown..
Bottom line: if you can measure it, do it. Adjust for the required PLUTO p-p level with a proper AC block and 50 ohms termination before you connect and enjoy.