Yes.
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No, Simon Peter is a distinct person from Simon. Both were apostles, however.
John's gospel names Simon Iscariot as Judas' father. (This was not the same Simon who became a disciple of Jesus and was renamed Peter.)
No. There is no indication that they are.
Paul was not crucified upside down, he was beheaded. Peter was the apostle that was, as he said he did not deserve the same death as Jesus.
There are no books the same in the Bible.