It's like the difference between gasoline and diesel fuel.
They're both liquids.
They both go in fuel tanks.
Doesn't mean they're interchangeable in any way shape or form. You put diesel into the tank of a car with an engine that runs on gasoline and you're going to be replacing the engine.
You can't just drop an N channel MOSFET into a circuit designed for a PNP transistor. They're completely different components.