ΔE 6.1, close: similar, with a visible difference side by side. German Panzer Grey is a little darker than Deep Sea Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). German Panzer Grey is a little darker than Deep Sea Blue.
The same difference applies the other way round: Deep Sea Blue is a little lighter.
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 Deep Sea Blue on the colour wheel See German Panzer Grey on the colour wheel
All matches: Deep Sea Blue equivalents · German Panzer Grey equivalents