1. Preheat oven to 325°. In a 10-in. pie pan, stir together gingersnap crumbs with melted butter and press into a crust. Bake until set, about 6 minutes. Set aside.
2. Increase heat to 350°. Beat cream cheese, mascarpone, and 2/3 cup sugar in a large bowl until smooth. Add eggs one at a time, beating for 30 seconds after each egg. Add pumpkin, 1 tsp. orange liqueur, citrus zests, cinnamon, ginger, nutmeg, and salt. Mix until smooth.
3. Pour filling into crust and bake until edges are firm but center still jiggles a bit, 45 to 50 minutes (bake any extra filling in ramekins). Cool to room temperature, then chill at least 6 hours and up to overnight.
4. When ready to serve, beat cream, crème fraîche, and remaining 2 tbsp. sugar and 1 tsp. orange liqueur in a large bowl until soft peaks form. Serve pie with orange whipped cream.
Note: Nutritional analysis is per serving.