ΔE 17.2, loose: different enough that you should pick on purpose. Brown RLM26 is much more muted, cooler than Quinacridone Burnt Orange.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Brown RLM26 is much more muted, cooler than Quinacridone Burnt Orange.
The same difference applies the other way round: Quinacridone Burnt Orange is much more saturated, 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 Quinacridone Burnt Orange on the colour wheel See Brown RLM26 on the colour wheel
All matches: Quinacridone Burnt Orange equivalents · Brown RLM26 equivalents