I've seen many queries on other sites as well with no definite answers. Take a panel to an auto shop that has a paint scanner tool. Their paint scanner will give the closest match.
is used on some Ford Focus's so it should be easy to find. It's not a perfect match but I think it would look decent on a Yanmar. Also Kawasaki motorcycles used a similar color.
SPRAY PAINT - FRAME GREEN: Yanmar Tractor Parts
OOPS!! misread that Hoye has the gray market colors. A Yanmar Authorized Parts Dealer may have the code or color for the lime green US tractors.
First time I saw a green Yanmar I was reminded of the Euclid earthmoving equipment of the 50's and 60's. Below is the only photo I can find of one with the original paint. Lots of 'restored' photos online - and none matched this color.
Euclid built some interesting earthmoving equipment. Jumbo offroad trucks and scrapers, and the TC-12 (several photos), a 450+ hp monster crawler with separate GM diesels driving each track.