No, James Horner is definitely your Surrogates.
There was an excellent podcast by Film Score Monthly, called Opportunity Makes a Thief, where they laid out a ton of examples of Prokofiev, Rachmaninov, Britten and others showing up wholesale in the scores for Star Treks II & III; however, where the podcast was hosted seems to have re-organized and lost it.
I have a copy if someone wants to hear it, and it's definitely worth listening to if you are interested in the short-cuts some composers take.