what I would like to do is where the kick drum is on it's track I'd like to change the voice from the kick drum from the Pop Kit to another kick drum instrument
Step number 1: Load up some new software instruments tracks. Instantiate the EXS 24. Load in some kick drum patches until you find some suitable options you want to try.
But I'm not sure how I get the new voice onto that track to use the beats(notes)(pitch)?
Step number 2: Drag the region onto the new software instrument track containing your alternate kick drum samples.
The Bass drum is using note"C1" in that track.
Step number 3: If the new kick drum samples on the new software instrument track(s) are not mapped to C1, the easiest way to deal with this is to transpose the MIDI region in the Arrange Window. There are several ways and Editors to do this.
Since the drums are already split into their own regions, the region in question contains only kick drum notes (on C1). The simplest way to transpose IMHO would be to select the region and transpose via the Region Parameter Box's transpose parameter in the upper left corner of the Arrange Window.
Tip: If you can load up an EXS24 instruments that have many different kick drum samples mapped across the keyboard, you can easily audition them in context by incrementing/decrementing the Region Parameter Box's transpose parameter while the arrangement is playing.