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Your probably fine, if your more specific on the parts on sure some one here could tell you for sure. You could always take take the parts you need off both motors and see if they match up
The engine parts are the same on all the models that I listed. The ignition parts are the same.
The midsections are somewhat different for each of the three types. But the 25" will not accomodate the gearcase for the 20" models and vice versa because the driveshafts are of different lengths. (The shift rods are easy to switch, but the driveshafts are not.)
The tilt assist cylinders have to be removed if you put the PT&T unit on the manual tilt midsections.