Anafi thermal photo msx

Hi, im using anafi thermal.

I need to convert msx photos to visible and thermal.
To do this I use exiftool, but I noticed something strange.
I have two parrots (different firmware version) in one I get
3264x2448 RGB resolution and 296x222 thermal resolution
In the other one rgb with the same resolution but the thermal is 310x234

Is the resolution defined by the firmware?
And why is the resolution not 160x120 like the camera’s thermal sensor?