Actually there is no difference. Its a name given to the top level of the professional game which indictaes the bast teams in the league which is made up of South Africa, New Zealand & Australia
The RWC is also known as the William Webb Ellis Trophy
National Rugby League(NRL) primership trophy
the fijiansor the Sevens'
William Web Ellis is often credited with inventing the sport of Rugby in 1823. He was a pupil at Rugby School in Warwickshire. His name has been immortalised by the William Web Ellis cup, the trophy awarded to the winning Rugby World Cup team.
The cup that is won at the end of a rugby world cup final is called The "Webb-Ellis Cup" Which is named after the great rugby player and the founder of rugby William Webb-Ellis. Some Biographist wrote "Whilst playing football, William caught the ball up in his arms, and instead of retiring back or punting forward, he rushed forward with the ball in his hands." This was at Rugby School and was the birthplace of the game.
The current trophy is called FIFA World Cup Trophy.
Rugby - That is its name world wide.
Jules Rimet Trophy
World Championship Game Trophy
it was originally called the Jules Rimet trophy
Jules Rimet Trophy (1930 to 1970) FIFA World Cup Trophy (1974 to the present day)