ΔE 8.8, close: similar, with a visible difference side by side. Light Green Blue is a little lighter, more muted, cooler than Field Grey Highlight FS-34414.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Light Green Blue is a little lighter, more muted, cooler than Field Grey Highlight FS-34414.
The same difference applies the other way round: Field Grey Highlight FS-34414 is a little darker, 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 Field Grey Highlight FS-34414 on the colour wheel See Light Green Blue on the colour wheel
All matches: Field Grey Highlight FS-34414 equivalents · Light Green Blue equivalents