ΔE 10.9, fair: the same colour family, but not a straight swap. Military Yellow is a little darker, more muted than British Uniform.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Military Yellow is a little darker, more muted than British Uniform.
The same difference applies the other way round: British Uniform is a little 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.
See British Uniform on the colour wheel See Military Yellow on the colour wheel
All matches: British Uniform equivalents · Military Yellow equivalents