Each tire manuf is different. Just the difference in stack heights (how high and spacing of the knobs) could drive you crazy. One 29 -2.4 could be smaller than a 29-2.2 if the 2.2 had huge stacks heights.
I am waiting for a set of Vittoria Mazza Trails 29×2.4’s for my Marlin 7 (2021) to aide in my winter commute as I can’t find a decent priced (under $300) fat tire bike for commuting and some minor trail riding. I’ll know in about a week if they will fit.