Difference between 2 versions of a Pillar song? [read desc.]?

On itunes go to the pillar album called "Fireproof [bonus track version]". There are 2 versions of the song "Fireproof". There is a "Mudrock Version" and a "Radio Mix". They sound almost identical. The only differences i hear is that on the mudrock version the chorus has more of an echo-ish sound and on the radio mix there is 1 extra drum fill.