if it is a figure you need to load it to the scene and parent it to the other hand.

You would be able to rebuild the cr2 to place it at the other hand but that means altering the geometry center and orientation before changing the cr2.  with the figure in the zero pose move the sword figure to the other hand and export it to an obj. That will become your new geometry. Check the obj file for body part names and change them from right to left. Then make a copy of the cr2, and change the body part names from right to left and change the geometry file name to your new geometry file.