When it comes to weight, the SKS does pack an additional 35 lbs. (mostly coming from the chaincase and beefed-up suspension). But even with the additional weight, at 443 lbs. dry, the SKS is still as light as any other brand of mountain sled.
The only other two notable differences between the sleds come in color/graphics and windshield design. The SKS offers a lot more protection from the wind with its 13-inch Deep Snow Mid windshield.