Raging Rose vs Khardic Flesh

How close are they?

ΔE 19.0, loose: different enough that you should pick on purpose. Khardic Flesh is much more muted, warmer than Raging Rose.

Can I use Khardic Flesh instead of Raging Rose?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Khardic Flesh is much more muted, warmer than Raging Rose.

Can I use Raging Rose instead of Khardic Flesh?

The same difference applies the other way round: Raging Rose is much more saturated, 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.