The geography of the area and the color palette have remained intact. Waikuteru found a way to freely modify parts of the world from Breath of the Wild. The Youtuber explains how it all works:
There are four accessible worlds in Breath of the Wild: the normal overworld you can see in the background, the world you are armed to when you enter a shrine, MainFieldDungeon (in this world you play when you play a Divine Beast or the last trial try to complete), [and] AocField (this is a new world added with The Master Trials DLC, better known as Trial of the Sword). The MainField … is divided into 80 map sections. The other 75 map sections are free for us to use.
See the result for yourself: