Cybertron Downshift/Alternators Wheeljack - PLEASE READ if you have them BOTH!!

I need to know if their heads are comparable in size.
I'm trying to expand my Classics, and had planned on a repaint of Cyb. DS as WJ, but that translucent orange in the head bugs me. I found a guy who casts translucent blue pieces for Alt. WJ's head, and was hoping I could stick them in DS's...
Anyone? Help?
I'm trying to expand my Classics, and had planned on a repaint of Cyb. DS as WJ, but that translucent orange in the head bugs me. I found a guy who casts translucent blue pieces for Alt. WJ's head, and was hoping I could stick them in DS's...
Anyone? Help?