No it does not. This is directly from Apple's website. The Second Generation 2017 12.9 iPad is lighter over the first Generation 12.9 iPad.
2nd Gen 12.9 iPad Pro wifi model weight.
1st Gen 12.9 iPad Pro wifi model weight
- Weight: 1.49 pounds (677 g)
- Weight: 1.57 pounds (713 g)
First link is weight for 2nd Gen wifi 12.9 iPad. Second link is weight for 1st Gen wifi iPad.
https://www.apple.com/ipad-pro/specs/
https://www.apple.com/shop/product/FL0G2LL/A/Refurbished-iPad-Pro-Wi-Fi-32GB-Silver
I didn't know that, it's nice to know that the 12.9" 2nd gen is lighter it might make it easier to hold.