ΔE 7.8, close: similar, with a visible difference side by side. Signal Blue is more saturated than Tenebrous Teal.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Signal Blue is more saturated than Tenebrous Teal.
The same difference applies the other way round: Tenebrous Teal is more muted.
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 Tenebrous Teal on the colour wheel See Signal Blue on the colour wheel
All matches: Tenebrous Teal equivalents · Signal Blue equivalents