ΔE 16.0, loose: different enough that you should pick on purpose. Beige is a little lighter, much more muted than Mustard Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Beige is a little lighter, much more muted than Mustard Yellow.
The same difference applies the other way round: Mustard Yellow is a little darker, much 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 Mustard Yellow on the colour wheel See Beige on the colour wheel
All matches: Mustard Yellow equivalents · Beige equivalents