ENG/Video Dopers: FMM-6 vs. FMM-8 Focus Module?

Can anyone tell me the difference between the Fujinon FMM-6 and FMM-8 Focus Modules? My new camera came with the rear control, but not the FMM.

The lens on the camera is: Fujinon TV Lens S14 x 7.3BRM-29 (Prism Optical System)

The reason I need to know is that I can get an FMM-6A module for about 1/3 the cost of an FMM-8. If I have to buy an FMM-8, I probably won’t (unless one pops up on eBay or something).