You are confusing jury nullification with refusal to convict. Jury Nullification implies an actionable striking down of a law based on the judgment of 12 citizens in one court case with one defendant. I am sure that you think that OJ was freed because of Jury nullification. But, hey the next time you get on a jury , pull out your "Jurors' Handbook" and start giving your lessons on constitutional law.
No. You are asserting that they are not the same thing and they are. Jury nullification is the refusal to convict. Meaning that the jurors judged the law to be unconstitutional and immoral. In fact, jurors considered Al Capone more moral than the government and wouldn't indict or convict him.