More or less what GHANMI said. For various systems we have seen backports of other translations, however it is typically only done when the game sees radical changes, notable changes or was an otherwise poor ports (if a Japanese game got translated to English but only in PAL countries in the NES era then it would probably be a poor port and things might happen there). Were there any changes that would cause someone to want to do such a project?
As you have a CFW custom game capable 3ds then you have region free.