ΔE 17.7, loose: different enough that you should pick on purpose. Elf Skin Tone is noticeably darker, warmer than Count of Tuscany.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Elf Skin Tone is noticeably darker, warmer than Count of Tuscany.
The same difference applies the other way round: Count of Tuscany is noticeably lighter, cooler.
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 Count of Tuscany on the colour wheel See Elf Skin Tone on the colour wheel
All matches: Count of Tuscany equivalents · Elf Skin Tone equivalents