I was specifically comparing TLR Front 2.2" to TLR Front 2.4" wheels which are farther apart on offset when compared to TLR Rear 2.2" to RB6 Rear 2.4"
I think a 2.0mm difference in track width will certainly be noticeable (at least that's the case in the on-road touring cars that I like to race), however that may be cancelled out with the extra width of the wheels... I'm looking forward to testing all the permutations to see if 2.4" is truly a better idea (or not).
2WD Buggy is a new class to me so I'm looking forward to the experimentation. It almost seems like a no brainer on paper to go with the 2.4" wheels simply because they're wider.