Half-Orc Highlight vs Wood

How close are they?

ΔE 7.5, close: similar, with a visible difference side by side. Wood is a little lighter, more muted than Half-Orc Highlight.

Can I use Wood instead of Half-Orc Highlight?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Wood is a little lighter, more muted than Half-Orc Highlight.

Can I use Half-Orc Highlight instead of Wood?

The same difference applies the other way round: Half-Orc Highlight 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.