What's the difference ?

Hello guys !

I'm new here so I don't know a lot about arduino. Recently I decided to purchase my own arduino uno rev3, but now I face a problem : What are the differences between the two microcontrollers show below ? The pics are from the official distributor in my country.

4c83008aa9a05bfb1f5a818921308974.image.538x354.jpg

350c2c5b39065013b7b085c4679c9b9c.image.538x354.jpg

d94148ecca27de89ddb740749db8d9cf.image.538x354.jpg

babe9d3f8563ea2f170dd55539f06310.image.538x354.jpg

This is how it should be: http://arduino.cc/en/Main/arduinoBoardUno
So the second one is real.
As you can see in this page, also the first version seems to be real: http://arduino.cc/en/Products/Counterfeit
Since they both are version R3, there should be no difference.

A page about clones: Send in the clones | Arduino Blog

I was mostly worrying about hardware differences....