i try to convert 2k10 headshape on 2k13 and 2k14 it is not success i try to do like this
what I found useful was doing the "link" trick the same way CFs are converted
load the 2K13 model you are editing
then load the 2K10 model you want to "convert"
Select the objects you want to bring over to 2K13 (in pink object mode, not the blue/yellow edit mode)
in the main 3D panel where you edit press ctrl+L
click scene, then to the main N2KM one, not the .001 one.
then you need to delete the .001 scene at the top of the blender window, its an X next to a dropdown menu
then you can use snaps to "trace" an object already in the 2K13 model over the converted 2K10 one
then when you are done, delete the 2K10 object you linked by right clicking it