ΔE 9.4, close: similar, with a visible difference side by side. Buff is a little lighter, cooler than Yellow Oxide.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Buff is a little lighter, cooler than Yellow Oxide.
The same difference applies the other way round: Yellow Oxide is a little darker, 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 Yellow Oxide on the colour wheel See Buff on the colour wheel
All matches: Yellow Oxide equivalents · Buff equivalents