This reminds me of Spielberg talking about the two Raiders themes that were combined as one to make the final version. That is how I think of the Jurassic Park music. Upon first hearing it and then subsequently, my impression is that it is very regal sounding music. I can't disentangle the front from the back. It is one. Anyway, Ludwig Van broke it down for us coherently thus :-
From LV's site, Lester's comment mirrors the exact same impression as I had, but he endorses his comments in a way that just seems plain "right" to me. The language of (film score) music.
The rock version is really nice! He has some pretty good other videos, check out the guy's take on Raiders and a knockout version of Silvestri's Avengers theme.