Will a 1994 Chevy Cavalier 2.2 engine fit in S-10 of the same year?

No, a 1994 Chevy Cavalier 2.2L engine will not directly fit into a 1994 Chevy S-10 without significant modifications. While both are GM products, the engine bays and mounting points are different. The S-10 typically used a different family of 2.2L engines (or larger V6s and V8s), and the dimensions and accessory placement would be incompatible.