Great question. Unfortunately the answer is no. Shimano changed the spline depth on the Mx100 series and therefore, an XTR M9100 power meter won’t fit on a Shimano XTR M9000 crankset. We have a separate article that explains all of your XTR M9100 power meter options: What power meter will fit my Shimano XTR MTB crankset?
April 27, 2021