If from the game, I think they would probably be concept art. I'm not sure if there is a complete digital copy of all the 2001 trading cards to check against, but perhaps this is where they are from? Most if not all of the other images appear on the trading cards. It kind-of looks like the simplistic CG images on some of the trading cards.
Looking at the relevant images, they do look quite similar to the visual style of the game, and I'm slightly open to the possibility of them being from there. However, the dramatic angles and muted colours of the Nui-Rama and Makuta battle look far more like cutscenes than actual gameplay. And the three cutscenes in the game that we know of don't feature any (non-Manas) Rahi or Makuta.
Edited by JrMasterModelBuilder, Feb 13 2014 - 10:16 PM.