Yes if they were written before the movie script was, in which case I can’t think of any exceptions. On the other hand, I am perfectly capable of loving both book and movie. I do not tend to enjoy books written after movies. I am always pleasantly surprised to find that many movies are based on books. One of my happiest surprises was from the movie “I Remember Mama” based on a fictionalized memoir, Mama’s Bank Account by Kathryn Forbes.