Hi,
Under BRC definitions for high care and high risk are:
High Care Area (Environment)
An area designed to a high standard where practices relating to personnel, ingredients, equipment, packaging and environment aim to minimize product contamination by pathogenic micro-organisms.
High Risk Area
A physically segregated area, designed to a high standard of hygiene, where practices relating to personnel, ingredients, equipment, packaging and environment aim to prevent product contamination by pathogenic micro-organisms.
The difference here is whether is needs to be physically segregated or not. While the both the High Risk and High Care Areas would require very good hygiene care, for example full set of protective gears (face masks, hair covers, dust coats, boots, gloves etc), thorough cleaning etc. and so on... but the High Risk Area should also have proper security in place, for example, security tags for personnels, or color coded uniform, or physical barrier in place (therefore requiring authorization tags for entry).
Hope that helps.
Rgds,
Eugene