According to this Wikipedia entry, the two are almost identical...
The difference is in the "Program Type" codes used by each system.

Should be fairly easy to define both codes in a table.

http://en.wikipedia.org/wiki/Radio_Data_System

While we're talking about FM radios and USA/Europe, I just thought of something: When I was stationed in Italy in the 80's, I remember the FM stations there being 50 Khz apart, rather than 100 KHz. In fact, my Sansui receiver has a switch in the back to make it compatible. Further research on Wikipedia (http://en.wikipedia.org/wiki/FM_radio) indicates that, while most of the world uses the same band of frequences (Japan being a notable exception) not all use 100 KHz, and not all are on "odd" channels.

So, for our European brethren, how does the Nokia FM receiver work in your country?