I have one of each and as Gray Wolf stated, the Raging Bull is a little larger and the grips are different -- the RB having more traditional rubber grips while the Tracker has the 'ribber' (ribbed) grips which conform to your hand.
The RB also has a 2nd cylinder release latch, similar to the ones on Dan Wesson revolvers.
The Raging Bull can be had in a greater variety of calibers as well than the Tracker, some of which have been discontinued.