Not sure exactly what you mean. If you are referring to consistency between shots then no, it makes no difference. The most consistent option is probably the stock valve as it has no moving parts that can get moved out of position (I haven’t had this problem with the MWS version of the NPAS, but on the WE version there are reports of the screw working loose during firing and thus the FPS changing.)
If you mean between skirmishes or changes to different brands/types of gas, the NPAS will mean your rifle has much more consistent FPS as you can adjust it to take account of different gas pressures or ambient temperatures (it only takes 5 or 10 minutes with a chrono) so you can always be under site limits, but never so down on power that you can’t hit anyone beyond 10 metres.