ΔE 15.7, loose: different enough that you should pick on purpose. Dawnstone is a little darker, much more muted than Field Grey Highlight FS-34414.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Dawnstone is a little darker, much more muted than Field Grey Highlight FS-34414.
The same difference applies the other way round: Field Grey Highlight FS-34414 is a little lighter, much more saturated.
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 Dawnstone on the colour wheel
All matches: Field Grey Highlight FS-34414 equivalents · Dawnstone equivalents