morph just triangles involved in the morph

I have a model in daz3d that is 7500 polygons. The model has face morphs for opening and closing the mouth. Is there any way to load these morphs into unity without loading another 7500 model? Can't I just load the mathematical differences between the triangles if I could somehow figure out what they are. daz can export .obj,.fbx,and collada.

Thanks, Dan