ΔE 5.9, very close: most people won’t see a difference side by side. USN Sea Blue is a little darker, more muted than RLM 83.
Yes, for most jobs. Very close match (ΔE 6). USN Sea Blue is a little darker, more muted than RLM 83.
The same difference applies the other way round: RLM 83 is a little lighter, more saturated.
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 USN Sea Blue on the colour wheel
All matches: RLM 83 equivalents · USN Sea Blue equivalents