Kagemusha (1980)

ordinary high school student, travels back in time to the Sengoku era (1549). He encounters a young lord who looks exactly like him and is told, “Be my substitute. I’m the eldest son of the Oda family, Oda Nobunaga.”

Both are epic jidaigeki Samurai movies about epic Fiercesome battles of warring States period....................................

Both movies are about body doubles replacing, acting as substitute to the Lord..............................

Both are epic jidaigeki comedy war movies about two of the greatest warlords of Japan. Both movies are very similar.........................................

Both are epic war movies with Art of War as theme............................................................................

Both movies are about conquests of Takeda Shingen, one of the most Fiercesome Japanese warlord ever...............................................................

Both are about kagemusha doubles, impersonating famous powerful warlords after death, in Hunger of power, to retain control, power of the provinces & domains.