Do Dynafit bindings have a right and left?
No, but it is a good idea to mark your skis for right and left, so you can place your best ski edges on the inside if you damage an edge during a trip. More, some boots have the Dynafit fittings molded in slightly crooked, and dedicating a right and left ski makes this moot (the skis will still be interchangeable in a pinch, but will function smother if used as designated).