Although there were some rugby-based board games available in the past, most of them are only found as "antiques" on the Internet bedding websites these days. The only two games currently available are:
1. CRASH TACKLE RUGBY
https://www.crashtacklerugbygame.com/
"Crash Tackle is a strategy based sports board game that is played by two 'Coaches' who must manoeuvre their team of 15 players around the field in a battle of wits, strategy and luck. Crash Tackle authentically mirrors the infinite variety of on-field rugby situations where the right moves bring points, but errors of judgement are punished!"
This US based game is focusing on comparing certain team skills in determining the outcome and rely on quite a complex structure of moving players around with a relatively complicated rule book.
2. RUGBY - THE GAME
https://www.kickstarter.com/projects/278948492/rugby-the-game
This New Zeeland based game is mostly using cards with no real game play based on the position of the ball or players on the rugby field.
None of these two games compare in any way with the features contained in RUGBY BOKX which further proves the game's uniqueness!