ΔE 17.7, loose: different enough that you should pick on purpose. Lavender Grey is noticeably darker, more muted than Thanatos Grey.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Lavender Grey is noticeably darker, more muted than Thanatos Grey.
The same difference applies the other way round: Thanatos Grey is noticeably lighter, more saturated.
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 Thanatos Grey on the colour wheel See Lavender Grey on the colour wheel
All matches: Thanatos Grey equivalents · Lavender Grey equivalents