ΔE 11.6, fair: the same colour family, but not a straight swap. Tiamat Orange is a little darker, more saturated, cooler than Safety Orange.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Tiamat Orange is a little darker, more saturated, cooler than Safety Orange.
The same difference applies the other way round: Safety Orange is a little lighter, 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 Safety Orange on the colour wheel See Tiamat Orange on the colour wheel
All matches: Safety Orange equivalents · Tiamat Orange equivalents