1997 Grand Prix used the Delphi DBC-7 ABS system. 1998 switched the the Bosch 5.3 system that was infamous for module failures. Bosch 5.x is a super common ABS system that was used by nearly every automaker in that era, and they were all notorious for bad modules. It also didn't support tire pressure monitoring, which is why 1997 is the only year to have that feature.
In any case, here is a pretty detailed list of yearly changes: