There's 3.
If you go to that page
https://www.tascaparts.com/v-2016-f...l4-gas/hvac--evaporator-and-heater-components
For some reasons there's 2 different diagrams with different numbers. On the first one, you can select #19 and 20. Then on the second diagram, there's #22 which is in reality #21 on the first diagram.
The 3 parts have different SKU but knowing how convoluted things can get when they SKU parts and the fact that I never had these in hand, I can't tell you if they are indeed different parts or it's only the SKU.
The ones people change all the times are the driver side which is called the Air Distribution Actuator:
And the passenger side is the Air Inlet Door Actuator:
Finally, there's the Temperature Door Actuator, but I have no idea where it's mounted on the HVAC box and the picture in the service manual is not the most helpful for locating it: