Question on console command "spf"

[zzz72w3r]

I am learning to make NPC face replacement mod using CK and the console command "spf" but the new face looks nothing like my character when I applied it to a NPC said Ysolda in this case.  However, other change does make it into the mod like different hair.  Is this because my character was created using ECE? 

 

Would RM help in getting ECE face to work or does spf only work with RM? 

 

What else do I need to know in order to make a mod that changes multiple NPC appearances with minimum fuss, with minimum being paramount?

 

Thanks

 

EDIT: Never mind.  It turns out I need to have the same dependency as using CME slots for ECE to get the faces right.