There was another Dragon Knights castle?! 1906 Majisto's Tower is one of those wonderfully terrible mid 90's sets that Lego threw together from over produced parts and seemingly only released in America (
LEGO Set 6043-1 Dragon Defender (1993 Castle > Dragon Knights) | Rebrickable - Build with LEGO
40601 Majisto's Workshop: Hands on review and Back of Box Builds. | The Rambling Brick
LEGO Castle Dragon Knights | Brickset
Toy [Junk] Lego Magic Dragon Castle "Lego System" 6082 | Toy Hobby | Suruga-ya.com