Gryph-Hound Orange vs Yellow Submarine

How close are they?

ΔE 31.0, loose: different enough that you should pick on purpose. Yellow Submarine is a little lighter, cooler than Gryph-Hound Orange.

Can I use Yellow Submarine instead of Gryph-Hound Orange?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 31). Yellow Submarine is a little lighter, cooler than Gryph-Hound Orange.

Can I use Gryph-Hound Orange instead of Yellow Submarine?

The same difference applies the other way round: Gryph-Hound Orange is a little darker, 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.