merge 

Socialist Autonomous Province of Kosovo and Autonomous Province of Kosovo and Metohija (1946–1974) basically describe the same thing. It's not really clear why the naming or constitutional difference should be used as a delimiter for article names, we didn't do that in case of the Yugoslav republics. The Vojvodina history articles are split in 1963, not 1974, and that also seems arbitrary. The common article name could be something simple and descriptive, such as Kosovo in SFR Yugoslavia.