ΔE 8.2, close: similar, with a visible difference side by side. Dark Battle Dress is more saturated than Matt Earth FS-34088.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Dark Battle Dress is more saturated than Matt Earth FS-34088.
The same difference applies the other way round: Matt Earth FS-34088 is more muted.
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 Matt Earth FS-34088 on the colour wheel See Dark Battle Dress on the colour wheel
All matches: Matt Earth FS-34088 equivalents · Dark Battle Dress equivalents