I'll give this a shot. The duraforce engine is designed with an above deck exhaust but the exhaust flow passes through a transfer pipe under the deck and up into the muffler. also, the engine mounting plate, looking at the parts viewer, looks different. I own both of these types of mower but never thought about a sweap.

the engines' exhaust ports are shaped different. The duraforce port is also larger. Will not bolt up. You should be able to find another junk mower with an F engine.