Mephiston Red vs Scab Red

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Scab Red is more saturated than Mephiston Red.

Can I use Scab Red instead of Mephiston Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Scab Red is more saturated than Mephiston Red.

Can I use Mephiston Red instead of Scab Red?

The same difference applies the other way round: Mephiston Red 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.