Existing switch has RED at the top, BLACK at the bottom (only has 2 connections) and the backplate has an earth terminal to which the earth is presently connected.
New switch as 3 terminals. COM, L1 and L2.
What colour goes to COM, to L1, to L2?
New switch as 3 terminals. COM, L1 and L2.
What colour goes to COM, to L1, to L2?