The GTS has a bit more duration on the exhaust(4* more, 248 vs 252) but the intake have the same duration but different opening and closing. This allows for slightly broader power range: a little more torque in the beginning and push the peak HP back a little. Seems to work best with a GTS IM or Diamante IM & higher compression. Valve lift is the same for both camsBecause a cam changes the way an engine runs?
I believe GT cams are more aggressive than GTS though. Anyone that knows the specs off-hand can clarify. I noticed gains when using GT cams in a GTS engine but not GTS cams in a GT engine.