Ionrach Skin vs Tooth and Nails

How close are they?

ΔE 20.6, loose: different enough that you should pick on purpose. Tooth and Nails is noticeably lighter, more muted, cooler than Ionrach Skin.

Can I use Tooth and Nails instead of Ionrach Skin?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Tooth and Nails is noticeably lighter, more muted, cooler than Ionrach Skin.

Can I use Ionrach Skin instead of Tooth and Nails?

The same difference applies the other way round: Ionrach Skin is noticeably darker, 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.