They stopped "punching" scallops out of skate wings a long, long, long time ago - at least here in the U.S. Right around the time whole skate wings became more desirable on their own & just as pricey as scallops.
Plus - it's virtually impossible not to be able to tell a circle of skate wing from a scallop. Not only are the textures completely different - skate flakes away like flounder when cooked; scallops remain solid - but in this day & age, when fake or disguised foodstuffs are so in the news & punished so publicly, no fishmonger with at least 1/4 of a brain would deal with anyone trying to perpetrate this older than old fakery. The competition is too strong.