Well, the first thing to look at would be are they the same tire,i.e. model(XKA,XLD,XK,XTXL,XTSM,XMINE) tread depth(D1,D2,E3,E4),etc. I would be very surprised if they were. Then I would look at are the pieces of equipment similar and doing the same job in the same conditions. My money is the...