Add enough cold water to reserved pineapple juice to measure 3 cups; pour into saucepan. Bring to boil.
Add to dry gelatin mixes in medium bowl; stir 2 min. until completely dissolved. Stir in cranberry sauce. Refrigerate 1-1/2 hours or until slightly thickened.
Stir in remaining pineapple, pears and nuts.
Refrigerate 4 hours or until firm. Top with reserved pineapple just before serving.