Switches don't typically have neutrals, as if you switched a hot to a neutral you would create a dead short. Extremely unlikely your switch has a neutral.
If you notice the center terminals on your switch are connected together. My guess is that this is power to the switch, as well as a binding terminal. Meaning power comes into the switch, and then goes somewhere else. Are these the brown and blue wires????
The single terminals (white and black I'm guessing) are switched power, one going to the fan, and one going to the light. You'll have to check the schematic on your range, but I would bet you lunch that the black and white are for the fan and oven light. Which one I'm not certain. You should be able to jump the brown wire to the black wire and see what comes on the fan or the light. Then you have your answer. Make sense? Let me know if it doesn't.
It would help if you told me what wires are on which posts.