Dubstep Gun Songs

I have a question about the dubstep gun.

In one mission in the story you get to use the dubstep gun because guns 'aren't allowed'. I won't tell which mission because I don't want to spoil anyone but those who played it will know what I mean.

There will be two songs, first the one that comes when you pick it up and later the person who gave it to you will put on another track. Now my question is, the first song that plays, can you unlock that one in free roam?

Or more easily said: is that third song option the same song from that mission or not, because I can't really remember how it goes.
 
In case anyone is wondering, the Saints-skinned gun is "Datsik & Excision - Vindicate-Excision" .. YouTube picked this up pretty quick >.>
 
I thought the 'amped up' dubstep gun in that mission had the same sound as the pink dubstep gun, it was just as catchy either way.
 
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