Want to know the overall difference between Flat White Coffee and Pumpkin Spice Latte? Which has higher calorie or caffeine content in Flat White Coffee or Pumpkin Spice Latte? Here you will know more information About Flat White Coffee and About Pumpkin Spice Latte. Get all the comparison for Flat White Coffee and Pumpkin Spice Latte at a glance below.