I guess maybe the H304 is not what was used in the CH-47A charts?

Maybe H78 is close?

https://www.modelshade.com/paint-conversion-chart/mrhobby-mrcolor/C304?filter=mrhobby-hobbycolor&sheen=restrict

EDIT:: I converted from Mr.Hobby to MrHobby? YIKES!!! TOTAL NOOB working