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Thanks. What I don't understand is why red is on 2 & black on 3 on one old switch with common linked? Other switch is red on common with black on 2.

New switch has common plus L1 & L2 on each switch. Old (non dimmer) has red on common and black on 2 on one light. Other switch has red on 2 with black on 3 and common connected to other common. Note this is just a one way switch with each switch controlling one light. How do I connect up this...