ΔE 18.0, loose: different enough that you should pick on purpose. Titan Buff is noticeably lighter, more muted, cooler than Leopard Stone Skin.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Titan Buff is noticeably lighter, more muted, cooler than Leopard Stone Skin.
The same difference applies the other way round: Leopard Stone Skin is noticeably darker, more saturated, 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 Leopard Stone Skin on the colour wheel See Titan Buff on the colour wheel
All matches: Leopard Stone Skin equivalents · Titan Buff equivalents