Field Grey Highlight FS-34414 vs Medium Grey Blue

How close are they?

ΔE 11.1, fair: the same colour family, but not a straight swap. Medium Grey Blue is a little lighter, cooler than Field Grey Highlight FS-34414.

Can I use Medium Grey Blue instead of Field Grey Highlight FS-34414?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Medium Grey Blue is a little lighter, cooler than Field Grey Highlight FS-34414.

Can I use Field Grey Highlight FS-34414 instead of Medium Grey Blue?

The same difference applies the other way round: Field Grey Highlight FS-34414 is a little darker, 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.