Flesh Tearers Red vs Frenzy Orange

How close are they?

ΔE 29.3, loose: different enough that you should pick on purpose. Frenzy Orange is noticeably lighter, more saturated, warmer than Flesh Tearers Red.

Can I use Frenzy Orange instead of Flesh Tearers Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Frenzy Orange is noticeably lighter, more saturated, warmer than Flesh Tearers Red.

Can I use Flesh Tearers Red instead of Frenzy Orange?

The same difference applies the other way round: Flesh Tearers Red is noticeably 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.