Matt Earth FS-34088 vs Eshin Grey

How close are they?

ΔE 7.6, close: similar, with a visible difference side by side. Eshin Grey is a little lighter, more muted than Matt Earth FS-34088.

Can I use Eshin Grey instead of Matt Earth FS-34088?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Eshin Grey is a little lighter, more muted than Matt Earth FS-34088.

Can I use Matt Earth FS-34088 instead of Eshin Grey?

The same difference applies the other way round: Matt Earth FS-34088 is a little darker, 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.