Arne, there were two differences.<br />First, the round points at the top were tweaked. Slams and tour championships gave a bit more, while the Lipton was aligned with the other Tier I's.
Second, the biggest difference, is in the "slam multiplier" line for quality points. In 1993, you got the same points for beating a player at every tournament. In 1994, you got 1.5X for beating them at a slam.