PADI will give you credit for current skills acquired through other agencies. I recommend that you present these skills to the instructor, and have him/her give you the appropriate credit. Also, regarding the Rescue Diver qualifications, PADI lists these other certifications for qualifying credit. I believe this is a sample list, and is not exhaustive: ACUC Master Diver or Sauvetage Scuba
ANMP - CEDIP Niveau 3 Autonome
ANIS Salvataggio Sub
AUSI Rescue
BSAC Dive Leader, Advanced Diver
CMAS Two Star Diver
FFESSM Niveau III or Niveau IV
FIAS Salvamento Sub + Certificate of CPR
IDEA Rescue Diver
IDD Rescue Diver or Divemaster
IDF Three Star Diver
NASDS Emergency Management
NAUI Diving Rescue Techniques or Scuba Rescue Diver
PDIC Rescue Diver
SAA Dive Leader (with Diver Rescue) or Dive Supervisor (with Diver Rescue)
SSI Stress Rescue Techniques or Master Diver
SNMP Niveau 2-Equipier or Niveau 3
SSAC 3rd Class Diver (with separate diver rescue certification) or 2nd Class Diver
YMCA SLAM or YMCA Divemaster
ANMP - CEDIP Niveau 3 Autonome
ANIS Salvataggio Sub
AUSI Rescue
BSAC Dive Leader, Advanced Diver
CMAS Two Star Diver
FFESSM Niveau III or Niveau IV
FIAS Salvamento Sub + Certificate of CPR
IDEA Rescue Diver
IDD Rescue Diver or Divemaster
IDF Three Star Diver
NASDS Emergency Management
NAUI Diving Rescue Techniques or Scuba Rescue Diver
PDIC Rescue Diver
SAA Dive Leader (with Diver Rescue) or Dive Supervisor (with Diver Rescue)
SSI Stress Rescue Techniques or Master Diver
SNMP Niveau 2-Equipier or Niveau 3
SSAC 3rd Class Diver (with separate diver rescue certification) or 2nd Class Diver
YMCA SLAM or YMCA Divemaster