That's like saying a human and an amoeba are basically the same because one is a micro-organism and the other is, well, also an organism. They've both got input

That's like saying a human and an amoeba are basically the same because one is a micro-organism and the other is, well, also an organism. They've both got inputs and outputs within an ecology! Surely the rest is an implementation detail... A psychologist doesn't learn anything useful from studying amoebas. A macroeconomist can't apply lessons from individual household economics either.