Any similarities the new bat wing has to the German Horton Ho IX is pure coincidence and not a copy .
The Horton and the Nakajimas project Z had the same mission . One was for the east coast and the other for the east coast .The interesting thing about the Horton Amerika bomber was there were plans to make drone version . The crew would only take it so far and get out to avoid the radiation blasts .
Both countries had more interesting submarine projects that had the same objective. The Germans were trying to put V2 ICBM versions on subs , and Japanese had built submersible aircraft carriers like the Sen-Tokugawa I-400 with global reach. A similar secret sub was used to ship nuclear materials to Korea for Japan from Germany for atomic research .