Hoping someone could help a noob out - At my local track they suggest M4 holeshot rears, and m3 holeshot fronts for 4wd buggy. I have the B44.2. I see a lot of different widths and I'm confused on what to buy.

I would ideally like to buy premounted tires on yellow wheels. AKA makes premounted 2.2" "rear" for B44, B44.1, and B44.2. 2nd question is that my B44.2 does not have the rear hexes, maybe the previous owner stopped using them. I assume I will need a pair of 12mm hexes? The current wheels use the pin.
Do I also use the 2.2" "rear" premounted tire for the front? Is the offset different? Are the tires themselves different? The previous owner included a few sets of fronts but they are skinnier than the rear.