Field Grey Base #2 (Grey Uniform) vs Skavenblight Dinge

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Skavenblight Dinge is a little lighter than Field Grey Base #2 (Grey Uniform).

Can I use Skavenblight Dinge instead of Field Grey Base #2 (Grey Uniform)?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Skavenblight Dinge is a little lighter than Field Grey Base #2 (Grey Uniform).

Can I use Field Grey Base #2 (Grey Uniform) instead of Skavenblight Dinge?

The same difference applies the other way round: Field Grey Base #2 (Grey Uniform) is a little darker.

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.