This will depend on the type of sentence you received before, and the decision will be made by the judge who resentences you.  If you are resentenced, you should receive a Minute Order from the court before you are released.  The Minute Order will say what happened in court.  Read it carefully to see if you have been ordered to report to probation or parole when you are released.  If the Minute Order says you need to report on probation or parole, you must report even if you think there has been a mistake.  You will also have to comply with any conditions that are ordered by the Court, probation or parole.