ΔE 5.5, very close: most people won’t see a difference side by side. Mortarion Grime is a little darker than Splittermuster Base. They are different kinds of paint: AK Interactive Splittermuster Base is an opaque base/layer paint and Citadel Mortarion Grime is a wash/shade, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 5). Mortarion Grime is a little darker than Splittermuster Base. They are different kinds of paint.
The same difference applies the other way round: Splittermuster Base 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 Splittermuster Base on the colour wheel See Mortarion Grime on the colour wheel
All matches: Splittermuster Base equivalents · Mortarion Grime equivalents