New poll for this one available on the original post at the top of the page! 
The music on both the English and German trailers is from the Tony Antony movie The Stranger’s Return aka A Man a Horse and a Gun.
The scene in which the wounded heroine crawls over to the hero and gives him a knife to cut himself free when he is tied upside down is a copy from the Garko movie Vengeance is Mine, only not as good. There is also the hero being framed for a crime he didn’t commit as in the recent Sartana sequel.
The plot device of a kidnap victim not being kidnapped is taken from $10,000 Blood Money.
I think both of these films were also written by Gastaldi.
Although the Italian title only refers to ‘Arizona’ based in the Italian dialogue in the US DVD ‘Arizona Colt’ is mentioned several times.