What is special about the "Steam Special Edition" of Tropico 3 and 4?

Taking a look at each of the game store pages on steam we see this.

Tropico 3:

The Steam Special Edition of Tropico 3 contains the following additional content:

Two additional maps for the sandbox mode:

• Verde Playa
• Coco Chico Map

Two additional costumes for the el presidente avatar editor:

• Female Avatar: Casual Clothes
• Male Avatar: Casual Clothes

Two additional accessories for the el presidente avatar editor:

• Female Avatar: Baseball Hat
• Male Avatar: Commie Hat

Tropico 4:

Special Edition
...includes an exclusive island (Isla Nublar) and El Presidente avatar costume (Luchador) and 50 Steam achievements. El Presidente is back to rule it all!