The music track that plays when Ray and Art are walking up to the Klopek house was, in fact, composed by Ennio Morricone. It is taken from the film "My Name is Nobody". It plays roughly 2:20 into the track entitled "My Fault?" and is exactly as it is heard in the film.

Looks like Joe Dante decided to go with the temp track on this one. While I think the cue Goldsmith wrote for the scene binds the score together much better (as Ray's Theme is now heard only at the end of the film when he exits the "hideous raging inferno" that is the Klopek house, both cues work effectively in the film.