 The endings of the USA and Japanese versions are basically the same, despite  the popular but erroneous story of Godzilla winning in the Japanese version.  In both versions the fight ends with Godzilla not surfacing, and Kong  swimming for home: the only minor difference is that in the Japanese version  both monsters emit two roars at the end of the fight, while in the U.S.  version only King Kongs roar can be heard on the soundtrack.