On March 1, 1781, the “Articles of Confederation and Perpetual Union” were signed by delegates of Maryland at a meeting of the Second Continental Congress, which then declared the “Articles” ratified. As historian Edmund Burnett wrote, “There was no new organization of any kind, not even the election of a new President.” The Congress still called itself the “Continental Congress”. Nevertheless, despite its being generally the same exact governing body, with some changes in membership over the years as delegates came and went individually according to their own personal reasons and upon instructions of their state governments). Some modern historians would later refer to the Continental Congress after the ratification of the “Articles” as the “Congress of the Confederation” or the “Confederation Congress.” (The Congress itself continued to refer to itself at the time as the “Continental Congress.”)
Sources: http://en.wikipedia.org/wiki/Articles_of_Confederation