Safety Orange vs Foxhide Brown

How close are they?

ΔE 17.3, loose: different enough that you should pick on purpose. Foxhide Brown is noticeably darker, more saturated than Safety Orange.

Can I use Foxhide Brown instead of Safety Orange?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Foxhide Brown is noticeably darker, more saturated than Safety Orange.

Can I use Safety Orange instead of Foxhide Brown?

The same difference applies the other way round: Safety Orange is noticeably lighter, 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.