The first one looks either Euro or American swivel gun c.19th that has been 'refashioned', a quite common thing for these types. The second appears to be an early Dutch 18th c. model, again modified and the breech cut down? The Dutch pattern was copied by the Malay sailors/pirates in Brunai and Macau as a similar form to the second called a lantaka, but I think yours is the Dutch model-
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