Comparatively, NFPA 13R facilities are ‘partially sprinklered’ to provide life safety and a moderate level of building protection. 
In other words,

NFPA 13R requirements provide for a level of protection that allows occupants to escape a building in the event of a fire. Conversely, 

NFPA 13 provides protection to not only get people out to safety,
 but also to control or extinguish the fire – saving the building and its contents.