Well, according to official 1945 FBI documents, he more then likely faked his own death and escaped to Argentina via sub and went into hiding in the Southern Andes with the help of a handful of wealth Nazi-sympathizing land owners in the region.

FBI Records: The Vault - Official Adolf Hitler FBI Report Created In August 1945 Mentions That He May Not Have Died, And Instead May Have Escaped By Submarine To Argentina And Went Into Hiding
https://steemit.com/conspiracy/@budz82/fbi-records-the-vault-official-adolf-hitler-fbi-report-created-in-august-1945-mentions-that-he-may-not-have-died-and-instead-may

That being said, as your post suggests the Hitler at that time very of possible been a different Hitler all together (look-a-like).