Comparing these two photos, I'm pretty sure the castle is the exact same color. The only real difference is camera type and sun placement. They might have done other work though that we didn't see. I know there was a broken window that needed to be replaced at the front of the castle
Old: http://hqwallbase.com/images/big/disneyland_castle-394305.jpg
New: https://pbs.twimg.com/media/B-yZkjQUYAAeyaV.jpg:large
It doesn't look very 'diamond overlay-ey' to me ...
Is the Sleeping Beauty walkthrough also available, or just the path through the castle?