Is a motor for a 1997 SC1 Saturn and a SC2 Saturn interchangable?

Technically yes. I have done this conversion, but there will be some problems along the way. The two motors both use the same sensor components and wireing. the throttle body may have to be swapped back due to vaccuum demands. the car will start and run, but without changing the engine computer it will generate a few pesky trouble codes, enough that the car would not pass emmissions.

it would fit in the body just fine everything generally lines up needs a computer otherwise itll be like pouring a water bottle through a garden hose, all you will get is a trikel and no real benefits