It will probably do the job one way or another. Japanese axles tended to use slightly different cone diameters and thread dimensions to those used by Italian (as in Campagnolo, Gipiemmie, Miche etc) manufacturers. Swapping axles was often a case of trying combinations of axles and cones until something usable was found. The 4mm extra OLD shouldn't be an issue as you should be able to set the axle so that 2mm is hidden in each drop out - worst case you can take a little off the axle once you're happy with the fit.