This needs some investigation. Discuss ideas and findings on the talk page. Specifically: Possibly more? Music, rest of the graphics, and unit names might be worth comparing.
The European version was a tie-in to the Legend of Prince Valiant cartoon. The US version stripped away all references to the show.
Prince Valiant has no credits, whereas Kingdom Crusade does.
Prince Valiant
Kingdom Crusade
Prince Valiant has support for English, French, and German.
Prince Valiant
Kingdom Crusade
In addition to a different introduction, Kingdom Crusade adds a series of help screens that can be browsed before starting the game.
Prince Valiant
Kingdom Crusade
KING ARTHUR AND
PRINCE VALIANT HAVE
DEFEATED CYNAN BY
TAKING HIS CASTLES
PRINCE VALIANT HAS
FOUGHT HARD AND HAS
DRIVEN CYNAN FROM
ARTHURS LAND
CYNANS ARMIES HAVE
TAKEN THE CASTLES
OF KING ARTHUR
MAY PRINCE VALIANT
COME AND RESCUE US
CYNAN HAS DRIVEN US
FROM OUR HOMES AND
HAS DEFEATED KING
ARTHUR
THY KINGDOM HAS
DEFEATED THE ENEMY
BY TAKING ALL THE
CASTLES
THY TROOPS HAVE
FOUGHT VALIANTLY AND
DEFEATED THE ENEMY
ARMIES
THY CASTLES HAVE
ALL BEEN CONQUERED
MAY WE LIVE TO FIGHT
FOR THEM ANOTHER DAY
THY LAND IS LEFT IN
RUINS AND THY ARMIES
HAVE BEEN DEFEATED
