So I thought my old switch for the outdoor lights was just 1-gang, since it's one big button, so I bought a S210. Upon removal of the old switch, it's a 2-gang, but with one button, and I'm guessing each circuit is for one light (2 lights total). So I'm unsure if I should wire them into the S210 (cramming 2 wires into each hole), or an S220 (cramming the two feed wires into the Lin hole). Help!

Hot wires are marked in red in the pictures.