I have seen all the Kubrick's movies and i wrote a thesis about Kubrick, called " Shining: from Stephen King to Stanley Kubrick ".
In the dubbed version in italian, Ullman talks about " Delbert grady "...in american version he says " Charles "..but this is a little trick of Kubrick.
In my opinion, and watching the movies, they are twins...perhaps for giving more terror.
My book is a comparison between book and film: I am not fool and I'm not a stupid...
But, THANKS A LOT..it's important to understand when you write correct.