110W power adaptor

I have a 110W power adaptor from a 2006 Mac mini thats not being used, I need a power adaptor for a late 2009 Mac mini, I was wondering if the 2006 power adaptor is compatible with the late 2009 Mac mini? I know the late 2009 mac mini also uses a 110W power adaptor with the same connector as the 2006, I'm just not sure if they are compatible.

Thanks