ΔE 17.8, loose: different enough that you should pick on purpose. Desert Tan is noticeably darker, much more saturated than Titan Buff.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Desert Tan is noticeably darker, much more saturated than Titan Buff.
The same difference applies the other way round: Titan Buff is noticeably lighter, much more muted.
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 Titan Buff on the colour wheel See Desert Tan on the colour wheel
All matches: Titan Buff equivalents · Desert Tan equivalents