* Minor internal component revisions: Things like piston design, camshaft profiles, or even the materials used in certain parts could have been slightly altered to improve performance, reliability, or emissions. These changes wouldn't necessarily be outwardly visible.
* Emissions systems updates: As emission standards changed over time, the 1994 model likely incorporated updated catalytic converters, sensors, or other emission control components to meet stricter regulations.
* Computer Calibration: The engine control module (ECM) programming would have likely been revised to optimize performance and emissions for the updated hardware.
Without access to detailed engineering specifications for both years, it's impossible to list every single difference. The changes were generally evolutionary rather than revolutionary. A mechanic or someone with access to detailed service manuals would be best equipped to provide a comprehensive comparison.