ΔE 8.0, close: similar, with a visible difference side by side. Saddle Brown is a little darker, warmer than Demon Red.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Saddle Brown is a little darker, warmer than Demon Red.
The same difference applies the other way round: Demon Red is a little lighter, cooler.
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 Demon Red on the colour wheel See Saddle Brown on the colour wheel
All matches: Demon Red equivalents · Saddle Brown equivalents