ΔE 7.5, close: similar, with a visible difference side by side. Light Green Blue is more muted, cooler than IJA Gray.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Light Green Blue is more muted, cooler than IJA Gray.
The same difference applies the other way round: IJA Gray is more saturated, warmer.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See IJA Gray on the colour wheel See Light Green Blue on the colour wheel
All matches: IJA Gray equivalents · Light Green Blue equivalents