Yes, the tune was slightly different and the meter/timing was different as well. The bit of tune you get when you follow kat's link is Brel's "Le Port d'Amsterdam" and we had a thread about it in 1997: click.
At tunes.com they have a couple of songclips with Brel actually singing, though not Le Moribond. I try to get you directly to the songclips: clickWolfgang