ΔE 20.0, loose: different enough that you should pick on purpose. Military Yellow is a little lighter, more muted, warmer than Demon Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Military Yellow is a little lighter, more muted, warmer than Demon Brown.
The same difference applies the other way round: Demon Brown is a little darker, more saturated, cooler.
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 Demon Brown on the colour wheel See Military Yellow on the colour wheel
All matches: Demon Brown equivalents · Military Yellow equivalents