Isn't there supposed to be more piano and stuff (i.e. at around 40 seconds in)? This version sounds bland compared with the trailer.

I didn't notice that, but I thought I'd take a look at the waveforms to be sure. Top is the trailer, lower is the MP3:

It's pretty obvious that the MP3 has far greater dynamic range since the voice and sfx need to stand out in the trailer (see first two arrows). The only real differences I see are that the MP3 is shorter and the last few piano notes happen earlier to reduce dead air.

I didn't notice any other differences while playing them together and switching between the tracks.