BEAT Neufchatel, 1 Tbsp. milk and sugar in medium bowl with whisk until blended; stir in COOL WHIP. Spread onto bottom of crust.
BEAT pumpkin, pudding mix, spices and remaining milk with whisk 2 min. (Mixture will be thick.) Spread over COOL WHIP layer in crust.
REFRIGERATE 4 hours or until firm.