ΔE 29.5, loose: different enough that you should pick on purpose. Flesh Wash is noticeably lighter, much more saturated than Armor Wash.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Flesh Wash is noticeably lighter, much more saturated than Armor Wash.
The same difference applies the other way round: Armor Wash is noticeably darker, much 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.
See Armor Wash on the colour wheel See Flesh Wash on the colour wheel
All matches: Armor Wash equivalents · Flesh Wash equivalents