Steel Non Metallic Metal

A delta of less than 3 (green blocks) represent a very close match, nearly visually indistinguishable.
A delta of less than 7 (yellow blocks) is usually pretty close and can safely be used as a substitute.
data from https://redgrimm.github.io/paint-conversion/index.html

1. Incubi Darkness
2. Scurvy Green alternative to incubi darkness delta of 3.18
3. Thunderhawk Blue
4. Field Blue alternative to thunder hawk blue delta of 4.67
5. Administratum Grey
6. Ulthuan Grey
7. Silver Grey alternative to ulthuan grey delta of 4.28
8. White Scar
9. Abaddon Black