ΔE 28.4, loose: different enough that you should pick on purpose. Tempest Blue Wash is a little lighter, more muted, cooler than Athonian Camoshade.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Tempest Blue Wash is a little lighter, more muted, cooler than Athonian Camoshade.
The same difference applies the other way round: Athonian Camoshade is a little darker, more saturated, 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.
See Athonian Camoshade on the colour wheel See Tempest Blue Wash on the colour wheel
All matches: Athonian Camoshade equivalents · Tempest Blue Wash equivalents