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Any scenario where the two would give different advice as to what is morally correct?
Classical utilitarianism says to maximize pleasure; preference utilitarianism says to maximize preference satisfaction. But someone's preferences can be satisfied without their knowing it, and they might prefer an outcome they know will be much less pleasant than some alternative.
For example, a dying writer might prefer to spend his last days finishing his novel, though this will mean forgoing morphine in order to think clearly. All things being equal, the preference utilitarian will say that I ought to help the writer finish, though the classical utilitarian may say that I ought to give him the morphine.
And the literal utilitarian will say How much does he like morphine?