ΔE 16.8, loose: different enough that you should pick on purpose. Gengis Khaki is noticeably lighter, cooler than Thondia Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Gengis Khaki is noticeably lighter, cooler than Thondia Brown.
The same difference applies the other way round: Thondia Brown is noticeably darker, warmer.
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 Thondia Brown on the colour wheel See Gengis Khaki on the colour wheel
All matches: Thondia Brown equivalents · Gengis Khaki equivalents