Assassin's Creed Brotherhood DLC

[Gun Runner]

While looking at Assassin's Creed Brotherhood's DLC I noticed that there's two of them. They both have the same title (Assassin's Creed Brotherhood - Animus Project Update 1.0 DLC) and description. However, one is 76.70 MB and the other is 144.29 MB. What's the difference?

[Variation-XBA]

I only see one listing.

The Animus Project 1.0 DLC adds a brand-new game mode, and a new map for the multiplayer.

[Gun Runner]

I only see one listing.

The Animus Project 1.0 DLC adds a brand-new game mode, and a new map for the multiplayer.
That's strange. If you try to view the DLC from the game it shows two.

[Unreal]

Animus Project 2.0 will be released soon. Which gives you a new map and another game mode.