More than a couple. Patrol, Investigations and Special Operations.
If I am not mistaking, if you have more than 2 years in LE, you can bypass this class and go straight for the State exam but I can guarantee that you would not pass the exam without taking the class. LE investigations and Private Investigations only share certain principals and 100% of nothing else. You would like PI work much better than the restricted LE investigative work, I promise.