Apple's website lists the weight difference between the M1 Pro 16" and the M1 Max 16" as 0.1 lbs, but we never got to the bottom of exactly how many grams that is... The actual difference, when not rounding to the nearest tenth of a pound, could be as little as ~0.01 lbs and as many as ~0.15 lbs. None of the traditionally more detailed reviewers have gotten to the bottom of this yet, as far as I know.