What is the difference between Lovers In Japan Reign of Love by Coldplay in album Viva la Vida and March Edition?

The song "Lovers in Japan/ Reign of Love" by Coldplay is the same song, it just has two titles. The song is featured on Coldplay's fourth studio album, "Viva la Vida or Death and All His Friends", which was released in June 2008. The song is often referred to as "Lovers in Japan" or simply "Reign of Love". It was written by the band's lead singer Chris Martin and produced by the band and Brian Eno.