Blood Red vs Red Cloak

How close are they?

ΔE 32.4, loose: different enough that you should pick on purpose. Red Cloak is noticeably darker, much more muted than Blood Red.

Can I use Red Cloak instead of Blood Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 32). Red Cloak is noticeably darker, much more muted than Blood Red.

Can I use Blood Red instead of Red Cloak?

The same difference applies the other way round: Blood Red is noticeably lighter, much 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.