As far as I see, the site doesn't mention if both will end up anyways on the final CD, one a-side and one b-side. If the votation is closed with almost a tie, they could simply make a double a-side, and put all the winner names (all who has voted) into the credits, no one would mind. I guess this is just for not being guily if people doesn't like the a-side. Not wotas, they'd buy the CD only with a cover and no songs just for the love of the girls.