There is not that much since its the same standard, however you can tell an import sometimes by the coat. They seems to have a thicker coat, their paws are a lot larger and they tend to have a heavier build.
Sorry thats not much help but the link below I think explains it the best
http://www.worldwideboxer.com/style.html
Sorry thats not much help but the link below I think explains it the best
http://www.worldwideboxer.com/style.html