JSC,
Can't comment on green chartreuse. However, I have my opinion of green pumpkin. Rosey's used to carry a standard RAL color described as 'Olive Drab RAL 6022 50%+ Gloss'. I couldn't find it advertised on their site. Perhaps if you contact them directly, they may be able to supply you with some.
It is an RAL standard color, so it should look the same for all companies that sell this color (RAL 6022).
Their olive gray and black olive powders don't approach the green pumpkin color that I'm accustomed to which is dark greenish-brown in hue. However, others may have a different opinion of what green pumpkin should look like. Unfortunately, no color name standards exist for the tackle industry.