Although I could answer this question according to my class; In general terms with all forms of martial arts how can we define the difference between them ?
****What else i would like to hear****
Why would a school or organization enforce this?
If not or why do you think that there is not?
Does school or form make a difference?
Edit: Example in the class that i teach my students are instructed to answer "Yes teacher" in response to commands given by myself by the Certified school instructor. However the respond to other commands given by a more experienced "instructors" would be "Yes sensei" or they (the instructor) may use another "yes ..." in place in they wish.