ΔE 8.2, close: similar, with a visible difference side by side. Abyssal Turquoise is more saturated, cooler than RLM 83.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Abyssal Turquoise is more saturated, cooler than RLM 83.
The same difference applies the other way round: RLM 83 is more muted, 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 RLM 83 on the colour wheel See Abyssal Turquoise on the colour wheel
All matches: RLM 83 equivalents · Abyssal Turquoise equivalents