IIRC matches organised by Riot are indeed played on the most recent patches as soon as they drop. The 2 week wait limit only applies to new characters and maps, but not nerfs/buffs etc.
Actually I also remember a time where NA was playing on 2.05 and EU VCT was on 2.04 or something at the same time (the patch numbers probably aren’t exactly right, it was just something around there)