ΔE 16.4, loose: different enough that you should pick on purpose. Middle Brown is a little lighter, much more saturated, warmer than Knight-Questor Flesh.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Middle Brown is a little lighter, much more saturated, warmer than Knight-Questor Flesh.
The same difference applies the other way round: Knight-Questor Flesh is a little darker, much more muted, 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 Knight-Questor Flesh on the colour wheel See Middle Brown on the colour wheel
All matches: Knight-Questor Flesh equivalents · Middle Brown equivalents