I wouldn't like to repeat myself, so I'll try to explain it as detailed as I can from memory.The process you're doing on Zbrush is retopology too, can you please share your method? Or where you got the software.
I need a base model (I usually use generic models converted from Nintendo Switch).
I open it in Blender, remove eye mesh to have only head mesh and export as .fbx.
Then you need to prepare a target model. Dmitri converted his faces to FIFA 14, so I just repeated the process above. If it's anything else, just check if they are on the same position.
Install Zbrush and then plugin named ZWrap, you can find both online.
Open ZBrush, choose any sample model. Go to right tab and click Import. Import Meshes as Polygroups. Do this with both models.
Scroll up the tab and click append and choose other model.
For both models you need to apply textures, but before you do this...you need to rotate them upside down. Yes, you have to.
Set them in order to have base model higher than target model. On upper bar, click bar Plugins > ZWrap.
The second window will open with 4 pages, on first, you choose mesh, that you will morph, choose the head (you'll have to move teeth manually). On second, you set points that your model will morph to. You have choose them on both sides. On third, you jest click the button to start. When it's finished, go to the forth page, and click the button on top-left corner. And done, apply this.
Now again go to Plugins > ZTexture. It's one button operation, just click it and I recommend to export it separately to preserve a transparency. Now you can export model to .obj
Now you open Blender. Import your base model, remove head and import .obj file with your morphed head. Paint vertex colors on it, move teeth and eye meshes, rename the mesh to the name of mesh that tou deleted and rename UVMap to map0.
Then export your mesh.
Now you need to open Blender again, import this mesh once again, remove vertex colors and paint them again. Why? Because if you won't do this, your face will be milky white. When you do this, export the mesh.
With texture, it will be exported flawlessly, no rotation needed, but you need to fill the empty gaps and clean other imperfections (usually around eyes, mouth, ears and use other teeth texture. I usually blend them from other proper FIFA texture.
When you do this it's all done.