Pretty sure he's doing a Mitsubishi build, so Mitsubishi cockpit green as distinct from Nakajima cockpit green. All of the model paint manufacturers are a close enough approximation adequate for a realistic suspensision of disbelief for modelling unless you want to get totally anal and Nick Millman's paint chip reference sources on his Aviation of Japan blog site. I build detail but there are not enough years left on the planet for me to spend time being that pedantic about an issue no-one will even notice unless a wildly varying shade. Here are a two most pragmatic OOTB options unless you are a hardcore AK, Vallejo or MIG fan. Tamiya XF-71 (Matt) Cockpit Green (Mitsubishi) or MRHobby Mr.Color C126 (semi-gloss) Cockpit Green (Mitsubishi). When I watched the video -can't be bothered trawling back through it, but pretty sure Amegraphy used GSI Creos Mr.Color C126.