I'm rewatching and I noticed, the brass/horn blasts that open the cue - that I always assumed Mickey-Moused Robo banging down the factory door - aren't there, just the cymbol as he's revealed in the frame. Also, when he's targeting the thugs, the light, bell-like chiming from the cue is also absent, only the bass underscore can be heard (all before the percussion starts).

What gives?

This happens all the time when scores are put into their respective films. It's all recorded to multitrack stems so that if the director doesn't like a layer (i.e: the synths in this case) they're dropped from the audio mix. It's not that it's a different version. The cue was thinned out for the film mix.

Check out the film mix of "The Dream" for another interesting bit...