Red Flesh vs Tan

How close are they?

ΔE 8.2, close: similar, with a visible difference side by side. Tan is a little lighter, more saturated, warmer than Red Flesh.

Can I use Tan instead of Red Flesh?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Tan is a little lighter, more saturated, warmer than Red Flesh.

Can I use Red Flesh instead of Tan?

The same difference applies the other way round: Red Flesh is a little darker, more muted, cooler.

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.