Sunny Skintone vs Tomb King Tan

How close are they?

ΔE 8.8, close: similar, with a visible difference side by side. Tomb King Tan is a little lighter, more muted than Sunny Skintone.

Can I use Tomb King Tan instead of Sunny Skintone?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Tomb King Tan is a little lighter, more muted than Sunny Skintone.

Can I use Sunny Skintone instead of Tomb King Tan?

The same difference applies the other way round: Sunny Skintone 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.