Art of Halo ('04) vs. Building Worlds ('11)

So is The Art of Halo: Creating A Virtual World worth getting if you already have Halo: The Great Journey: The Art of Building Worlds?

I want to know if Building Worlds contains some of the same concept art that is in The Art of Halo, or if it has completely new concept art. If anyone could clarify this for me that would be terrific!

The art of Halo only has things from Halo 1 and 2 while the Art of Building Worlds has art from all the game even a little bit of Halo 4 then the art from all the books, comics, and Legends. So if you like more of the jackpot, I’ll go with The Art of Building Worlds.