there are something missing in your story.if you want renewal your Residence you only need to show Labor Employer in immegration your old contract then Employer stamped on( Residence renew APPlication) .your PRO only need to go to Labor main Dept if ur work Visa pass 5 years.there is no different labor stamp its only 1 stamp if its new or renew.i told you there is something not clear in your story

thanx