I don't think they had the same range on live either. I believe denon's has always had a larger range. The first archive of EQDiva from March 2001 even lists the 2 songs having different ranges:
Chords - Song Radius: 30 feet
Denon's - Song Radius: 35 feet.
Now the P99 wiki doesn't list the PBAOE ranges, but I don't think either have been decreased.
The difference between P99 and live is that chasing mobs have a larger hitbox when chasing in a straight line than their live counterparts. This is a known issue that is very difficult to remedy. The work around is to get better at running in circles.