ΔE 5.9, very close: most people won’t see a difference side by side. Ratling Grime is a little darker than Ochre Brown. They are different kinds of paint: AMMO by Mig Ochre Brown is an opaque base/layer paint and Citadel Ratling Grime is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 6). Ratling Grime is a little darker than Ochre Brown. They are different kinds of paint.
The same difference applies the other way round: Ochre Brown is a little lighter.
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 Ochre Brown on the colour wheel See Ratling Grime on the colour wheel
All matches: Ochre Brown equivalents · Ratling Grime equivalents