Puree the remaining butter, cream cheese, sour cream, eggs, 1/3 cup of the sugar, vanilla, and salt in a blender until thoroughly combined, 30 to 45 seconds. Pour the cream cheese mixture over the noodles, add the apricots and raisins, and stir to combine. Transfer the noodle mixture to the prepared pan and sprinkle with the remaining 2 tablespoons of sugar and the nutmeg. Cover with foil and bake for 35 minutes. Uncover and continue to bake until the pudding is set, slightly puffed, and golden around the edges, 15 to 20 minutes. Cool for 15 minutes before serving.