The 4G93 has onlee one belt. Because it does not have balance shafts it does not have the "small belt" to which yu are speaking of. It has just one belt that turns the waterpump and the cam.
Do not confuse the 4G37 engine which is also a 1.8 engine with this one. The 4G37 is a 1.8 engine that had a Camshaft timing belt and balance shaft belt (small belt) but this engine is has not been produced since 1993.
The 4G9 series of engines has no balance shafts and has onlee one timing belt.
Check the diagram ive put in