Ork Flesh vs Hulky Green

How close are they?

ΔE 25.8, loose: different enough that you should pick on purpose. Hulky Green is noticeably darker, much more muted, cooler than Ork Flesh.

Can I use Hulky Green instead of Ork Flesh?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Hulky Green is noticeably darker, much more muted, cooler than Ork Flesh.

Can I use Ork Flesh instead of Hulky Green?

The same difference applies the other way round: Ork Flesh is noticeably lighter, much 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.