ΔE 10.8, fair: the same colour family, but not a straight swap. Tiamat Orange is a little darker than Flickering Flame.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Tiamat Orange is a little darker than Flickering Flame.
The same difference applies the other way round: Flickering Flame is a little lighter.
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 Flickering Flame on the colour wheel See Tiamat Orange on the colour wheel
All matches: Flickering Flame equivalents · Tiamat Orange equivalents