Can you explain the two different versions?
the outer diameter of the adapter ring. Buff is smaller than the Fotodiox.
I don't remember the exact sizes but they are both available from multiple sources.
Another option is to get elinchrom adapter rings and the E version of the Godox/Cheetah bracket.
The main advantage with the elinchrom is that it keeps the modifier closer to the bracket.
Fotodiox is a good source for the adapters for their boxes and Buff now offers the Elinchrom and Bowens rings for their boxes.
Probably the best way to make sure you get the right ones.
(Thanks for the diameters Rand. Didn't see your post when I wrote the above.)