Cryo's Dune was a completely different type of game (adventure), and was more or less developed and released in parallel to Westwood's Dune. Westwood's Dune is not a sequel at all, it was intended to replace Cryo's about-to-be-canceled game that never ended up being canceled, forcing them to name it Dune II: Battle for Arrakis to distinguish itself from Cryo's game.
You learn something new every day! Thanks - when I played them I was too far out of range for me to get info on game development at the time, iirc I even played them out of order.
Dune really was a brilliant game, and really its balance was pretty good, especially considering it was a time when the word balance itself hadn't been coined.