Blender to Unreal Stylized Shader (Q/A+Workflow)

Yes, I did them separately, because at the time, the control net feature was experimental for facial features. File>Append> (target the head model collection).blend and once it's on the body scene, scale the head rig, position it with the head of the body. You can Select the head rig and the body rig, with left shift click in object mode. Press CTRL+J to join both armatures. Then, enter edit mode, and parent the face root to the head root bone. Yes, I might join them soon, since I'm experimenting with my own LORA anime model, and the face control net feature is now fully developed. Not promising anything soon, tho. Thanks for letting me know this is of your interest. -Pierre.