Here is what I can share off the top of my head. I am not looking at any charts so I may be corrected. The Blue nozzles are numbered with the gallons per minute on the nozzle like the rainbird nozzles for their rotors. The Red Nozzles on the older Rotors were not like that. What I generally do for residential is use 2 Blue for half circle, 4 for full circle and 1 for Quarter circle blue. This is matched precipitation with gallons per minute in a residential application. This is off the top of my head.
I have seen contractors that did replace the red nozzles with blue nozzles using the same number of the red corresponding to the new blue nozzles and that will kill every system that was designed to its capacity. I recommend that you avoid doing this.
Good Luck