ADD boiling water to gelatin mixes in large bowl; stir 2 min. until gelatin is completely dissolved. Add cold water, zest and juice; stir until well blended. Refrigerate 1 hour or until thickened.
STIR in mangos and pomegranate seeds. Pour into 9x5-inch loaf pan sprayed with cooking spray.
REFRIGERATE 4 hours or until firm. Unmold onto serving plate. Serve topped with COOL WHIP.