Originally Posted by Naoki Yoshida
The First, where the Shadowbringers story will take place, does indeed show similarities to areas on the Source. This is due to the splitting of Hydaelyn into fourteen shards over 10,000 years ago—each of these separate worlds went down their own path with their own history. Naturally, their history and evolution would divulge from this point, and so we did not repurpose any existing assets.
The development team considered the evolution and history of the First and created this world from the ground up. While it might appear to have similarities, I am confident players will always have the feeling that nothing is quite exactly the same. The only commonality would be the people. The visual appearance of each race on the First and the Source may be the same, but their philosophies and heritage are quite different. I think elements such as these are one of the real joys of exploring the First.