As MLF already said, the positive differences were just her improved serve (finally able to get cheap points off it!) and the drive volley, which she really didn't execute that often (but it added to making her opponents feel overwhelmed).
The 3 major negative differences: (a) she was no longer absolutely, incredibly fearless on the major points, (b) her movement and stamina were by then exploitable, and by 1997: (c) she lost the severe angles, her rallying became powerful, aggressive, yet mortal. The Grafs, Hingises and Williamses could retrieve, force the error, get in a power shot of their own, exploit the movement issue, exploit the stamina issue, etc..
It all came back for Seles for 6 matches during Roland Garros 1998, right after her father's passing (please see her semi against Hingis for how she should have played Martina each and every time). But (sigh) against ASV, in the finals, she sort of froze, hitting her forehand hard and deep (bit again with no real angle, no variation) to ASV's backhand. All ASV did was block it back until the error came (which for Seles was often a sign of fatigue). It was for me the most frustrating third set to watch.
Someone is quietly turning back the clock...to them bulldozer dayz...
Always on the lookout for a great tennis match.