Hello.
Sorry for the late reply.
Referring to laanguiano`s question. I compared the product catalogues of Festool U.S, Finland, Sweden and Germany and it seems that the improved Rubin 2 abrasives (released in 2012 as Shane said, replaced the older Rubin abrasives that were different in color) are sold as Rubin abrasives in the U.S. They are sold as Rubin 2 in at least in the referred countries. The same applies with the Brilliant, Titan, and the Platin abrasives. I can see from looking at the introduction of Rubin abrasives on the Festool U.S website that it has all attributes that Rubin 2 has. So based on this, I think maybe it is the same product but sold under a different name in the U.S. This might also explain the color of the Rubin abrasive in laanguiano`s picture.
This is my assumption and I don`t have any exact information about this but you can easily come to this conclusion. In any case I myself think that is nothing to be worried about because I`m sure that in all countries the customers are getting the same good quality abrasives regardless under what name it is sold, Rubin or Rubin 2, Titan or... and so on so forth.
Referring to the question grbmds asked. In short, the new version of Rubin (2) abrasives is more resistant to clogging and is more long lasting compared to the old one. Similar kind of updates have been done to other abrasives in the past, for example Titan and Brilliant but this has happened many many years ago.
Referring to the question Alex asked. I don`t know for sure but I think they are some kind of batch numbers that are used possibly for quality control and tracking.
I also took a couple of more pictures for comparison as I told earlier that there is a color difference between Rubin and Rubin 2.
I hope this shed some light on this matter.