Export a mesh from Zbrush and modify it in Max - then export it and run the script.
Updated with screenshots and script changes
The script will generate a new .obj file.
(it needs the original .obj exported from Zbrush and the new .obj from Max)
Refresh the model in Zbrush(import tool in edit mode)===>and the Zbrush will use the updated geometry correctly on all subdiv levels!!
(useful in applying a new pose in Max after the Zsculpting.Changing the UV generate crashes in ZBrush)