No, that's not how it works. The CIS version is determined by the players themselves. Why do 70% of the players at the CIS tournament use Warlord Tactics? If they were fans of SOD, it would be SOD. The tournament isn't tied to a specific version.
Is the billiards championship also determined by the participants? If 70% are Russian, then it's "CIS." If 30% play pool, does that mean it's not "CIS"? It's a silly comparison, but the point is clear.