Senshi Skin vs Tyrant Skull

How close are they?

ΔE 7.8, close: similar, with a visible difference side by side. Tyrant Skull is more muted, cooler than Senshi Skin.

Can I use Tyrant Skull instead of Senshi Skin?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Tyrant Skull is more muted, cooler than Senshi Skin.

Can I use Senshi Skin instead of Tyrant Skull?

The same difference applies the other way round: Senshi Skin is more saturated, warmer.

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.