Has anyone tried to use a later switchblade style key (say 1998 A4) to an older 94-97 A6?

Ive just purchased An older shape A6 but the last owner as some how managed to lose both sets of remote key fobs. So all i have is the standard key without buttons. I dont have much spare cash to spend on this and dont even know if its possible....any ideas and help would be grateful.