Hello keyable,
That depends if the data is accurate or not.
Usually this information is not required for PhotoScan and the model can be georeferenced based on the camera location coordinates only. The incorrect information for the orientation angled, however, may cause the georeferencing errors, so even if you are loading the orientation angles I could suggest to use lower value for "camera accuracy (deg)" parameter in the Reference pane settings dialog (like thousands of degrees) - it would practically disable the camera orientation angles information from the utilization for georeferencing/optimization procedures.