I wouldn't go quite that far. LS is pretty average when it comes to weight. Kioti is a bit on the heavy side for most models, but not always. Deere, Case, LS, New Holland, Massey, etc are all frequently in the same ballpark....somewhere in the middle. Kubota usually comes in on the light side, but not always, and Mahindra usually comes in on the very heavy side, but not always.
All similar machines...open station around 50hp gross:
Take a new Deere 4049....3,770lbs. A new LS XR4046H....3,870lbs. A new Kioti NX5010....4,068lbs. A new Kubota L4760...3,847lbs. A new Mahindra 5010...3,836lbs. A new Mahindra 5035....4,939lbs! I don't think 1-200lbs is worth considering in this size machine.
The problem (for lack of a better word) is that with the SCUT sized machines it doesn't take a whole lot in the way of features, options, or a slight difference in wheelbase/machine size to add 3-500lbs, and that can be significant for a machine weighing around 2,000lbs. Just a slight bump in size makes everything else have to go up in size, and the next thing you know, one machine weighs 500lbs more, but when they're parked next to one another, you only see a slight difference in outward appearance. The bigger machines (like I mention above), are often built around a wider range of power and they already have a lot of the extra size/strength added....no need to keep them light for the average customer, as they aren't likely being used to mow lawns.