Yes I have Dark Green as well I am not sure what they are calling the green Neocaridina, but I have indeed seen it for sale. There is still much debate about Green Shrimp as I am sure you are aware of.
Here are a couple very helpful species descriptions on Green, Neon Green, and Dark Green Shrimp. The Green Neocaridina are so far as I have seen been called Neocaridina sp. "green"
You got that right and I think it doesn't help much when importers just grab a name out of a hat either. To bad science isn't more interested in these little creatures and spending a little more time with identification....
I would even wager a guess that perhaps some of these generic labeled shrimp are new species as well as some folks are having trouble finding a species description fitting their "Green Shrimp"
You say you have some of the Neocaridina Sp that are green? Is there a chance you could show a photo and do they indeed breed true?