True Blood vs Mayhem Red

How close are they?

ΔE 8.5, close: similar, with a visible difference side by side. Mayhem Red is a little lighter, more muted than True Blood.

Can I use Mayhem Red instead of True Blood?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Mayhem Red is a little lighter, more muted than True Blood.

Can I use True Blood instead of Mayhem Red?

The same difference applies the other way round: True Blood 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.