After getting that Jenkins Ferry musketoon, I hunted down an article in North/South Trader from 1992, written by Meigs Brainerd. In it he discusses the differences in the Arkansas, Port Hudson, and Jenkin's Ferry variants.
Two points of interest (at least to me) - 1) the Jenkins Ferry variant "might" be of Confederate manufacture, and (2) the other musketoon variants are probably US manufacture and issued to USCT regiments, specifically the 1st and 2nd Kansas.