Every new release contained updates and fixes made since the previous releases. Being the last release, the North American versions is the most up to date. A patch will be released quite soon (they said they were hoping to get it out this week) to bring all other localizations up to the North American release (what was referred to as the super patch).
Steam doesn't have the 1.03 version due to any kind of bias; they got the latest version because they released it later.
