Ease of turning by hand 36-60-2000?

[Raze ST Truggy]

I just sold my converted Raze buggy with a V2 36-60-2000 and just recieve a V2 36-60-2000 that I bought used. One was significantly easier to turnover by hand than the other. Does this sugest that the one easier to turn by hand may have a problem? weak magnet (demagged)?

I'm going to test it out in my rustler and see if I can tell a difference. I was just hoping that someone here might have some insight for me. Thanks

-Brian