The SL2 series used a 4 cylinder, dual overhead cam engine with a timing CHAIN that did not need replacing until the head was removed.
You DO, however, need to properly maintain the serpentine belt, which drives the alternator, Power Steering, AC, and water pump. Don't let THAT belt break, since the engine will overheat quickly and can damage the head gasket.
But... you don't need to worry about the timing belt, since there isn't one. The timing chain is INTERNAL, and is constantly lubricated, making it last much longer than a timing belt.
The Saturn sl2 does not have a timing belt, it has a timing chain. And under most conditions it does not need replacing.
The DOHC SL2 has a timing chain.
Timing chain
This proceedure is covered in the chiltons Saturn book available at auto zone and ect.
The 4 cylinder Saturn's all had timing chains.
Timing BELTS are outside the engine, run dry, and have no external lubrication. Timing BELTS should be replaced according to the manufacturers schedule. But the SL2 is not equipped with a timing belt, it uses a timing chain. Timing chains are internal, well lubricated, and designed to last as long as the rest of the engine. You shouldn't need to replace the timing chain until you rebuild the engine.
You are correct that the SL2 uses a timing chain. However, since it uses a timing chain it does not need to be replaced as does the timing BELT. In general, a timing chain should last the life of the engine.
Timing chain
It does not work because it has a timing chain instead.
Get a service manual. Removal of the timing chain cover and head is needed first.
1993 Saturn sl2
I am prettysure you can change the motor as long as the body structure is the same and you have skill in this sort of thing.