ΔE 9.1, close: similar, with a visible difference side by side. Tan (USAF) is a little darker, more saturated than Ionrach Skin.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Tan (USAF) is a little darker, more saturated than Ionrach Skin.
The same difference applies the other way round: Ionrach Skin is a little lighter, 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.
See Ionrach Skin on the colour wheel See Tan (USAF) on the colour wheel
All matches: Ionrach Skin equivalents · Tan (USAF) equivalents