ΔE 22.5, loose: different enough that you should pick on purpose. Light Bismuth Yellow is noticeably lighter, much more saturated, cooler than Tyrant Skull.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Light Bismuth Yellow 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 Light Bismuth Yellow on the colour wheel
All matches: Tyrant Skull equivalents · Light Bismuth Yellow equivalents