That green historically has been very tricky. Only a few good painters I know have come close; but that's just my opinion.
There is a range of greens one could use and achieve very similar results on their replicas. It's shocking how much misting other colors over another can shift the whole thing drastically. So even in person the challenge faced is: how much was the green on the real helmet misted over, vs how much was it pre-mixed?
The answer is somewhere between and I dont feel I can say for sure.
In my opinion, the Floquil/Archive-X Light Green hue should not be used as a basecoat right out of the jar; only relying on misting and weathering to tone it down. Id recommend mixing in a grey or really anything else from the known colors anyone would like to test to achieve a nice looking Fett green.
The color green selected for the EFX I felt was the best starting point. If you weather and mist that color down I think the result would be quite convincing. Below are some pics I've collected to dhow the green shifting in different lighting. The first pic of the real ESB shows the green as similar to some of the EFX shots. However even that pic of the real one I wouldnt say is representative of how that green really looks in person.