When you cc a letter, say to a doctor, do you copy the letter exactly including the inside address or do you change the inside address to the person you are ccing and the salutation to that doctor also?
The person receiving the CC gets EXACTLY what went to the original recipient. Otherwise, they are simply receiving their own personal letter.
Either approach is okay, but you should not put "cc: Dr. Miranda Richardson" if Dr. Richardson is also getting her own letter. If you do that, you may want to add a line to the original that say something like "I am also advising Dr. Richardson of the circumstances via separate correspondence" -- though you should write that in your own words.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.