Both CGR and CATPART are CAD/3D model formats from CATIA software, so it's natural to assume if any kind of cgr to catpart conversion or export is possible, it would be done with this software.
We have not found any useful information this export unfortunately, so in case you are in help with export or handling of CATIA files, it might be best to reach out to CATIA support or perhaps some CATIA online community for further assistance.
Updated: October 6, 2023