When the cause alleged for not pronouncing sentence is that the person brought before the court to be sentenced is not the same person against whom the verdict, finding of the court, or judgment was rendered, the court, if necessary, shall postpone the pronouncement of sentence for the purpose of hearing evidence on the allegation. If the court decides that the allegation is true, it shall discharge the person from custody unless the person is in custody on some other charge. If, however, it decides that the allegation is not true, it shall proceed to pronounce sentence.