San d'Oria is my favorite city in FFXI and I love what they've done. If you look at the images side by side the geometry is almost identical. Other than little details here and there they've mainly just added those statues in the plaza and a few spires to Chateau d'Oraguille so it looks more befitting the home of royalty in a society that thinks very highly of themselves. The front of the structure is still spot on to the original, all the way down to the placement of the windows and where the flags are hanging.
https://i.imgur.com/VqwDtnr.jpeg
https://i.imgur.com/K9F6RsU.png
Keep in mind that they're working with the current FFXI team on this and many of the former team members are on the FFXIV team. It's very possible that this design for Chateau d'Oraguille was people from the original team fulfilling their original vision.