Stone Grey vs Griffon Claw

How close are they?

ΔE 15.1, loose: different enough that you should pick on purpose. Griffon Claw is noticeably darker, more muted than Stone Grey.

Can I use Griffon Claw instead of Stone Grey?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Griffon Claw is noticeably darker, more muted than Stone Grey.

Can I use Stone Grey instead of Griffon Claw?

The same difference applies the other way round: Stone Grey is noticeably lighter, 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.