The most accurate response regarding the similarity in the way King and Lincoln use the word "freedom" is:
Both King and Lincoln acknowledge that change is needed in order to bring freedom to every citizen.
Both leaders articulated the importance of freedom and equality, but they also recognized that significant societal changes were required to ensure that these ideals were fully realized for all. Lincoln spoke to the unfinished work of the nation following the Civil War, while King emphasized the urgent need for civil rights and justice in his time.