"Williams is such a strong creative force and such a superb craftsman that he will inevitably take ownership of any influence" - mh7635
That just nails it and says what I couldn't put into words. it is the reason for the futility of finding a section of any artist's work that is like another even though overall it is totally owned by the artist because it his style. Star Wars, E.T., Jaws, The Fury, etc. etc. etc. - they are not any other composer, they are John Williams.
What is James Horner? What is his style? There is no discernible style, just a mix of other composers' work and cliches of film music arranged skillfully. But anyway I am not interested in spending time trashing that music, it was just an observation after being forced to hear it watching Star Trek II - a great film afflicted by mediocre music - exactly the reverse of the first Star Trek - a mediocre film benefitted by one of the greatest film scores ever written.