Paul, ??
On my computer speakers the bass in the second one is about twice as loud. In the first one, it's turned down. I should say the engine's turbo sounds.
I bet when I load it, they'll be the same!
BTW, this isn't a SD70ACe! Think a little bigger.
Some people won't know the difference anyways.
I do like some sound sets horns better than others. If I was more adventurous, I'd use the computer program from Mark S to swap out the horns.