Your current switch simply completes the circuit by joinging the two wires together ( effectively). I suspect the existing switch has 3 holes marked ""common" (L1) and (L2)
Changing one of the wire from L1 to L2 will simply operate the light when the swith toggle is in the up or down position. I like my lights to operate when the switch is is the down position.
It doesn't matter where the two wires go as long as the light comes on.
All the switch is doing is connecting the live in to a live out.
Just experiment, nothing can happen as their will be no neutral available.



