The regions of Dûshera and Mûmakan were altered completely (the former is now a sparsely populated realm of halflings and dwarves, the latter an unruly land of orcish tribes). Other realms were modified as well (but less dramatically so). The timeline and other details were wholly reworked to fit with Ukrasia. And I changed the name of the Court and the region named after it from “Ardor” to “Urdor.”
Also, the overarching aim of the deadly Court of Urdor differs significantly from that described in Amthor’s module. The "ritual" (involving 8 stones of "unlight") will remain the same. But, roughly, "my" Court aims to use the ritual to bring back their leader Queen Everekka (ruler of the "Night Elves," banished to another plane at the end of the Elvish Era), whereas the original Court sought to destroy the sun and moon. However, the structure and the organization of the Court itself will closely resemble the original version -- including the use of the card deck to communicate (an idea that Amthor acknowledged was taken from Roger Zelazny).