ΔE 16.9, loose: different enough that you should pick on purpose. Raw Sienna is a little lighter, much more saturated than Tallarn Sand.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Raw Sienna is a little lighter, much more saturated than Tallarn Sand.
The same difference applies the other way round: Tallarn Sand is a little darker, 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 Tallarn Sand on the colour wheel See Raw Sienna on the colour wheel
All matches: Tallarn Sand equivalents · Raw Sienna equivalents