Wow I've been reading about the 120 for a long time and never read a single thing regarding an Auto Focus without LS, good catch!
I might selfishly suggest you work with an experienced/specialized dealer. We can name every one of these lenses off the top of our head. I'm always surprised at how much time some clients (not necessarily you, since I don't know you, but for sure others that I've dealt with) will bang their head against the wall for hours on google when I (or a tech at another experienced/specialized dealer) could have answered their question immediately, and answered the questions they didn't know yet to ask.
The 120D AF was made in two brandings: Mamiya 120mm AF D and
Phase One 120mm AF D. Those are the same lenses. Same thing with the two brandings of the 120mm MF D.
There is also a 120mm TS lens which can be used for macro with the addition of extension tubes, but for a number of usability reasons we don't normally recommend this lens.