There are differences between the two but also similarities so I will make some points.

The active ingredient in No Rinse Sanitiser is often also contained in Hospital Grade Disinfectants. 

QACs which is short for Quaternary Ammonium Compounds are a common ingredient in Hospital Grade Disinfectants.

No Rinse Sanitiser is used at a minimal rate to control microbe populations on surfaces but not be poisonous to humans who eat food prepared on the surface which have not had the sanitiser solution rinsed away. No Rinse Sanitiser is used on already cleaned surfaces at an inuse QAC rate of 200 parts per million.

Hospital Grade Disinfectants are used to clean and sterilise dirty surfaces at an inuse QAC rate of 4000 parts per million or more then rinsed away after the cleaning is done.