Yes, there are changes from the Silmarillion. How could there not be. That is a massive book written more as a reference for Tolkien than as a single cohesive narrative. It’s not the kind of writing that would translate directly to video. It needs some translation. I got out my 1977 edition to peruse after the shows, but am not surprised if there are differences.
Also, yes, there are some dark skinned people in this new work. Big deal. If that kind of thing “takes you out of the story” then perhaps you should ask yourself why that is.