ΔE 11.0, fair: the same colour family, but not a straight swap. Inktense Crimson is a little darker, more muted than Mephiston Red. They are different kinds of paint: Citadel Mephiston Red is an opaque base/layer paint and Scale75 Inktense Crimson is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Inktense Crimson is a little darker, more muted than Mephiston Red. They are different kinds of paint.
The same difference applies the other way round: Mephiston Red is a little lighter, 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 Mephiston Red on the colour wheel See Inktense Crimson on the colour wheel
All matches: Mephiston Red equivalents · Inktense Crimson equivalents