The pans for the forward facing induction, from Lycoming, are the same for 180 HP and 200HP. The intake pipes are different. If you want stock fit pipes you need to get the ones appropriate to the engine you have. As Charlie suggests the 200 HP pipes will work on the 180 HP motor with some spaces and special fitting of the pipes. The 200 HP pipes on the 180HP engine, won't be stock 180hp pipes but they can be made to work.
Good Luck,
Mahlon
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