In the RN SAR is not a career specialisation.
Having been posted to a SAR unit (Gannet SAR Flt or 771) you would undertake the appropriate conversion courses and medical training. After 1 or 2 tours in SAR you would then normally return to 'frontline' operations. For many that means another conversion/refresher cse to Merlin/Lynx etc and taking those specialist SAR/medical skills into the frontline.
With respect to medical protocols the RN SAR currently operate under 3 Grp Orders so the med training is identical.
SAR H will undoubtedly transform the way we do business and ameliorate the differences between dark/light blue and the MCA chaps.
Unique to the RN is the opportunity for a limited no of its rearcrew to trained as SAR divers.