ive got a spool in the rear on one of my trackers and im wanting to put it i the front of another tracker i got will it work

If you have a 96 and up Tracker, yes.  If not then no, you need the larger splines up front.

Ok another question are the ring and pinion the same size front and rear on a 94 and down I know the carriers are different but they look the same

You will probably want to swap over to a Samurai third member in order to get the steel diff.  The main difference is the 96 and up have the larger splines that come with the mini-spool.  It's sort of like how you have to switch to heavy duty axles to run a mini-spool up front on a Samurai.

Ok another question are the ring and pinion the same size front and rear on a 94 and down I know the carriers are different but they look the same

The ring and pinions are not the same size front to rear.

The ring and pinions are not the same size front to rear.

Oh, yea.  That as well.  I was just thinking about the mini-spool.