Replacing a propane stove with a wood stove --HELP NEEDED

I need to remove a propane heating stove and install a woodstove that I already own. I'd like to install the woodstove in the same spot as where the propane stove sat and I'd llke to use the same venting pipe if possible. The problem that I see is that the propane stove uses a 4.5" vent pipe off the back of the stove and it continues to be 4.5" pipe as far up the chimney as I can see (only a foot or two) also, the propane vent pipe is thin, flexible aluminum pipe that goes up the inside of the chimney, while the woodstove connecting pipe is 6". I don't know if the woodstove can be used with 4.5" flex vent pipe from the propane stove or if it needs bigger, steel pipe for wood fires. Does anyone know? Thanks.

Peter
Norwell, MA