Enoch Gridley's map of Georgia was extensively reworked and updated between 1819 and 1822, but how does one know the same copperplate was used for both maps? 

On the original (top), one can see the "South Boundary of the United States" between Mississippi Territory/Georgia and Florida. On the updated version, one can see faint remnants of the word "South" (GREEN arrow) on the Alabama/West Florida border. 

The GA/FL boundary now slopes slightly northward from east to west, but one can see faint remnants of the original border (RED arrow) just above the "R." designating the St. Marks River. 

As a result of this border shift, the confluence of the Flint and Chattahoochee Rivers to form the Appalachicola River  has also been shifted NW and the lower Flint River has a more westerly course (YELLOW arrow).

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