Targor Rageshade vs Hellion Red Wash

How close are they?

ΔE 18.6, loose: different enough that you should pick on purpose. Hellion Red Wash is noticeably lighter, more saturated than Targor Rageshade.

Can I use Hellion Red Wash instead of Targor Rageshade?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Hellion Red Wash is noticeably lighter, more saturated than Targor Rageshade.

Can I use Targor Rageshade instead of Hellion Red Wash?

The same difference applies the other way round: Targor Rageshade is noticeably darker, more muted.

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.