As far as I know: the international versions of Pokemon have the visual style of the Japanese Blue, and the Pokemon distribution of the Japanese Red/Green. The JPN edition of Blue had some new locations for certain Pokemon: Jynx could be found in the Seafoam Islands, Ditto in Rock Tunnel, Lickitung in the Safari Zone, etc.
Also, JPN Blue had different in-game trades, different Game Corner prizes (like Horsea), and IIRC, an exclusive version of the Unknown Dungeon.
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