Is there another film with this plot?

This is an old post, but for others in Carolina and elsewhere who may be curious....

The basic premise of Branded, con artists passing off a fellow criminal as the long-lost son of a weathy family, was used again a year later in Two Of A Kind (1951), staring two of my favorite actors Edmond O'Brien and Liz Scott. Two Of A Kind has a modern (1951) rather than and Old West setting and differs in other respects, but the story seems to sprout from the same root.

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He maketh His sun to rise on the evil and on the good... St. Matthew 5:45

Not westerns, but "The Great Impersonation" has a good guy who has wasted his life, discovering an evil, enemy agent is his double.

"The Prisoner Of Zenda"; a vacationing Englishman is persuaded to pose as an heir to a throne due to his uncanny resemblance.

Soy 'un hijo de la playa'

O'Henry's short Story "A Double Dyed Deceiver" used a similar plot. It has been made into a movie a number of times -- In 1920 with Jack Pickford; in 1930 with Gary Cooper in a film called the Texan, and in 1939 in a movie called The Llano Kid with Tito Guizar. The basic plot was also used in an episode of the 1950's series The Millionaire.

The basic plot of a bad guy assuming the identity of a good guy and then accidentally becoming a good guy has been done before and since.
A few years later, Audie Murphy starred in "Ride A Crooked Trail" where Murphy played an outlaw being pursued by a marshal who accidentally falls off a cliff. He assumes the identity of the marshal and takes up the duties of a lawman in a new town.

William Powell in "I Love You Again" is a businessman who recovers from amnesia and discovers he's a conman. At first deciding to take advantage of his respected position in town, winds up falling in love with his wife and turns into a good guy even after his former partners in crime show up.

Soy 'un hijo de la playa'