Does my 94 cheyenne have a vortech engine in it or did Chevy different during that year?

No, a 1994 Chevrolet Cheyenne did not come with a Vortech engine from the factory. Vortech is a supercharger *manufacturer*, not an engine manufacturer. Chevrolet used their own engines (small-block and big-block V8s, and inline-6s) in their trucks during that year. A Vortech supercharger *could* have been added as an aftermarket modification, but it wasn't a factory option.