Hi Dave. Hope your having a good time in Italy.
Question #1 - They all have the same backs because it's a card game played on line. I've never played, but from what I understand it's like Topps' Match Attax.
Question #2 - The numbers at the top are a unit of measurement. The higher the number, the better the player is in that particular area of the field. Defenders have a high red number. Attackers have a high green number, And if you're a midfielder, well you get the idea.
Question #3 - The grid in the bottom right corner is simply part of a goal area (one post and part of the crossbar). The important part here is the color in the box. Purple = goalie ,Red = defender, orange = midfielder, green = forward
By looking at the color in the corner box, and the numbers that are given as a rating you can figure out different combinations. For example, who's a good attacking midfielder and who's a good defending midfielder.
Question #4 - I'm not sure, but I believe that set was never released in the US. However with the growth of the sport here many people are buying those sets on ebay. I purchase Panini Megacracks from Spain on ebay even though it's only distributed in Spain. When it comes to soccer cards, there's almost nothing unique to the country you're puchasing the cards in, unless they have subsets to that specific country. The cards you purchase, for example, I believe are sold in all of Europe and parts of Asia. It's a lot easier, and more cost efficient, to sell the same set all over the planet.
Hope it helps you out.