ΔE 28.8, loose: different enough that you should pick on purpose. Warlord Purple is noticeably darker, much more saturated, cooler than Dark Rose Tan.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Warlord Purple is noticeably darker, much more saturated, cooler than Dark Rose Tan.
The same difference applies the other way round: Dark Rose Tan is noticeably lighter, much more muted, 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 Dark Rose Tan on the colour wheel See Warlord Purple on the colour wheel
All matches: Dark Rose Tan equivalents · Warlord Purple equivalents