Ok where’s the weight 850 vs 1000

Hi, so I’m looking to get a xtp 1000 or 850 so I compare specs on can am site and it says the 1000 is 37 lbs heavier than the 850. As far as I know the 2 machines are identical except the 1000 has a longer stroke. Anyone care to enlighten me on the difference? ENGINE / DRY WEIGHT*
850 / 730 lb (331 kg)
1000R / 767 lb (348 kg)