Great Ven! Thanks for the info. I wanted to make sure I would not need to have to order extra tail caps!
I found some photos that are very helpful to anyone else wanting to know about the HI vs FD versions.
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ZL SC600fd Plus MK III

ZL SC600w MK III HI

I know it is not the IV versions but its a pretty close to the general idea.
I do like the flood on the FD Plus more than the narrow beam of the HI.
Look at that brute force wall of light on the Plus! It lights up the house in the background better than the HI!