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