Acording to Apple you shouldn't:
Note: Adapters that shipped with the MacBook Air (Original), MacBook Air (Late 2008), and MacBook Air (Mid 2009) are not recommended for use with MacBook Air (Late 2010) models. When possible, use your computer's original adapter or a newer adapter.
You can find more info Here: http://support.apple.com/kb/HT2346
Message was edited by: ChrisAr155