Duplicates of both stereo and mono versions of Save Me Some Sugar in DLC1 and DLC2?

[Voxatious]

Suggestion

Let me preface this by saying I'm aware of the differences between the stereo and the mono versions of this track. That is not what I'm talking about.
both dlc1 AND dlc2 directories have the same exact sound files:
../sound/music/flu/jukebox/save_me_some_sugar_mono.wav
../sound/music/flu/concert/save_me_some_sugar_stereo.wav

so I guess my question is... why? from what I can tell they're the exact same duration, length, type, etc.
removing both from either of the 2 directories is a free 75 mb freed up cuz sound files are pretty spacey, especially music files that are typically longer in duration.