Central Park is 76% larger than Prospect Park (Brooklyn).
Area: 3 km2 calculated
Central Park is an urban park in the New York City borough of Manhattan. It was initially opened in 1857, on 778 acres of city-owned land. In 1858, Frederick Law Olmsted and Calvert Vaux won a design competition to improve and expand the park with a plan they titled the Greensward Plan. Wikipedia
Area: 2 km2 calculated
Prospect Park is a 585 acres public park in the New York City borough of Brooklyn located between Park Slope, Prospect-Lefferts Gardens, Ditmas Park, Windsor Terrace and Flatbush Avenue, Grand Army Plaza and the Brooklyn Botanic Garden. Wikipedia