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I always look to Fred for these questions
Awwwww Merlin, I'm blushing!
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Bad news: as with any color question, there can be a great deal of controversy. Curiously, model companies do not always do their research, or worse--research bad information.
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Some things just get lost in translation.
Good news: we modelers seem to be driving a lot of the interest in sleuthing the truths of colors. Just last year, IIRC, a secret source in Japan released to an researcher of Imperial Japanese aircraft an "original and complete set of IJNAF colors!"
I do not know if they used it as a source but see
Review: White Ensign Paints - Japanese WWII Colors All that said, there was no color known as
jungle green in IJNAF. Checking Mr. Donald W. Thorpe's venerable master work
Japanese Naval Air Force Camouflage and Markings World War II (incidentally, IIRC he recently said at
J-Aircraft.com that he was planning to reissue an improved edition), the colors are:
BLACK-GREEN
DARK-GREEN
DARK GREY-GREEN
LIGHT GREY-GREEN
LIGHT OLIVE GREEN
Newer works list greens and greys for specific manufacturers.
I would defer to Tamiya for their IJN Green, unless you are building a field-camouflaged Zero. The the green could be whatever.