I am not sure of these cases, but many newspapers were part of a press association which distributed stories to its members during the Civil War. The Nov 16 stories suggest that they were members of a press association that distributed news from a common source.
The News Media and the Making of America, 1730-1865
The success of the Sun and other daily newspapers led to another media institution: the press association. As penny papers competed with established papers and with one another, they sought the most current news, and their news gathering methods became increasingly aggressive. To “beat” their rivals, New York newspapers used fast harbor sloops, special pony expresses, and even carrier pigeons to shave a few hours off the time needed to get news from Europe and Washington, D.C. In 1846, with the start of the Mexican-American War and the early development of the telegraph, timely information became significantly more costly, and the highly competitive newspapers were drawn into something new: cooperation. The proprietor of the Sun, Moses Yale Beach (1800-1868),organized the leading newspaper publishers of New York to pool their resources to get the war news. The original members included, in addition to the Sun, the Herald, the Tribune, the Courier and Enquirer, the Journal of Commerce, and the Express. This informal group gradually evolved into the New York Associated Press (NYAP), which became a formidable news monopoly in the late nineteenth century. The power of the NYAP was eventually broken by a rival group of Chicago newspaper publishers known as the Western Associated Press. Under their leadership, a new national press cooperative was formed in 1892, known simply as the Associated Press.
I knew there was some sort of proto-AP service. I've seen too many identical articles in different papers for there not to be some sort of wire sharing service among various newspapers. Good info, jgg.