You can't directly compare dfficulty of 24-player content like CT and 8-player. Just the fact of being 24 persons and having to co-operate among all the alliance adds an extra difficulty, so mechanics need to be more forgiving to mistakes. You can't have the type of difficulty where one person's fail of a mechanic means a party wipe in 24-player content.

I suppose Alexander normal mode will be more difficult and take longer to learn than Steps of Faith, but not a lot more. Coil with echo and nerf is much more difficult than Steps of Faith.