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