The Crossing Symmetry of Strong Intractions

This is the crushing symmetry idea of strong intractions. It's a property of two dimensional conformal field theories that this is always true. But it's not true in the standard model. Another kind of crossing symmetry where you compute some scattering amplitude and then you consider the same amplitude were exchange and incoming an outgoing particlea ri, those are equal by those are equal in some way. What was that calledto that of a different name? I guess that would be s t channel duality.