It's a confusing question. We kind of do the same thing but, as my five-year-old would say, we're not 'in the same family'.
A registrar is usually employed by their local council. His or her key responsibility is to collect and maintain public records - primarily of births, deaths and marriages. Unlike a celebrant, a registrar can grant you an official marriage certificate and declare you legally married.
A celebrant, on the other hand, is a very different animal. We cr