I found these images long ago on wikidot, but still not know what's the difference between them
so anyone could help me know why & when they have these difference 
They aren't really versions - they're printings. There were minor changes in the box design between printings, as well as a change in card stock.
Plainly put, there was only two versions - all-silver pips (Fan Back), and silver-and-red pips (Circle Back). The Circle Back was discontinued at the same time as the Bicycle Black Tiger all-white pip deck. I believe that the Circle Back version came first.
In those images, I believe the deck you see without the barcode was the first printing they made, followed by the deck to its left. In the box designs in the second image, you're seeing the silver/red Circle Back deck with the simple "Viper" logo, a later design with the silver/red Circle Back and a "Viper" logo with a descended "V" and "R" to resemble viper fangs and lastly, an all-silver Fan Back sans the "Viper" logo, which I presume is the current model.
Don't quote me on this, but I believe that like most of the older Ellusionist decks, these were available, depending on when you bought them, in either an Air Cushion finish (couldn't tell you which stock, possibly Bicycle Casino) or an Air Flow finish on UV500 stock (reactive with UV light). However, due to the lack of white surfaces, I suspect this deck may never have had a UV500 Air Flow version, since the UV500 stock was very costly and without any of the plain surface visible, there was no white to react with UV light. I will say, however, that the most recent version (Fan Back only) is probably in Performance Coating/Finish (they've used both terms before, it's just another name for Magic Finish) on a heavy-grade USPC stock.
Some collectors go all freaky about the different printings and will pay a premium for the older ones, while others who aren't completists and are more into the design and using the cards really aren't bothered by this as much - some flourishers might even prefer the newer Fan Back deck, since the all-silver pips look nice in fans and the Performance Coating makes fans silky smooth.
Be careful about becoming a completist collector - down that path, madness lies...
