No, the WIKI isn't American only - if it was, it wouldn't include the B4 Limited, the twin disc B4's, the 2nd generation B4's, any of the 250's, any naked B6, the 2004 B6, 2005-2006 650 air-oil cooled model, naked B12's other than 2001-2003, or the 2006 B12.
Like I said, EU uses the model year codes, too (and perhaps other world markets?)... my info source happened to use the letter codes for all Suzukis, regardless of whether this was officially used in every market or not. You may (or may not) find the model year code info handy should you need parts from a non JDM bike to support yours. I did go ahead and add the "Z" to the 250 & 400 Limiteds based on your input.