Used differently-- but I would like to change your sentences to avoid further confusion: I accused him of wrecking the car. = I said that he wrecked the car. I blamed him for wrecking the car.
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Only difference of preposition
Blame takes the preposition (for)
Whereas accuse takes the preposition (of)
About these two sentences second one is right
My Examples:
Blame - I know you did it
Accuse - I think you did it.