Marsy's Law and previous crime victim acts

What is the difference between Marsy’s Law and previous national crime victims acts?

Dozens if not hundreds of national laws passed dealing with criminal activity. Our constitutional amendment is unique as it is the only effort that, once successful at the state level or ultimately successful at the national level, creates true equal rights for victims of crime in the criminal justice process. Currently, those accused of crimes and those convicted of crimes see their rights coming from the Constitution, whereas victims do not. Hence victims too often are the second-class citizens in the court and in the criminal justice process. We have seen over and over again that simply having statutory rights continues to leave too many victims to be revictimized by the criminal justice process.