I have a head surface mesh and a pial surface mesh obtained after segmentation of a T1 MRI scan. I am going to importing these into Homer2 Atlas Viewer as subject anatomy. 

However before I can do this import successfully, I need to bring the two meshes into the same coordinate system. At the moment they are in different coordinate systems (as pictured) and I need to bring the pial surface mesh into the head surface mesh. I am a little unsure how to do this. 

Does anybody have any experience with this? Or any advice on what I could do possibly?

Thanks,

Maheen