How to set up robot_localization config when using differential: true

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I was reading the robot_localization docs and it says that when setting the differential parameter to true:

all pose (position and orientation) data is converted to a velocity by calculating the change in the measurement value between two consecutive time steps. The data is then fused as a velocity.

Does this mean that my config should set the position data to true or the velocity data to true?

i.e.

odom1_config: [true, true, false, # X Y Z
           true, true, true, # ROLL PITCH YAW
           false, false, false, # VX VY VZ
           false, false, false, # VR VP VY
           false, false, false] # AX AY AZ

or

odom1_config: [false, false, false, # X Y Z
           false, false, false, # ROLL PITCH YAW
           true, true, false, # VX VY VZ
           true, true, true, # VR VP VY
           false, false, false] # AX AY AZ

This is for an outdoor skid steer robot (two_d_mode false), with the odometry source described above coming from a ZED camera. The ZED odom topic only provides pose data, no Twist.