There's the rub. Generally the green is the regular life, eythelene-glycol coolant, good for 2 years.
Some of the red/purple can might also be the same.
The trick is to determine whether or not extended life coolant was put in your system.
FYI, while having my first bus serviced at Prevost, they put in regular life, EG coolant (green) as well. I've never had any shop put in or ask if I wanted to change to extended life.
Ray