RLM 81 Version 2 vs Tundra Taupe

How close are they?

ΔE 7.1, close: similar, with a visible difference side by side. Tundra Taupe is more saturated, warmer than RLM 81 Version 2.

Can I use Tundra Taupe instead of RLM 81 Version 2?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Tundra Taupe is more saturated, warmer than RLM 81 Version 2.

Can I use RLM 81 Version 2 instead of Tundra Taupe?

The same difference applies the other way round: RLM 81 Version 2 is more muted, 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.