Tornado Grey vs Warpfiend Grey

How close are they?

ΔE 11.6, fair: the same colour family, but not a straight swap. Warpfiend Grey is noticeably lighter, warmer than Tornado Grey.

Can I use Warpfiend Grey instead of Tornado Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Warpfiend Grey is noticeably lighter, warmer than Tornado Grey.

Can I use Tornado Grey instead of Warpfiend Grey?

The same difference applies the other way round: Tornado Grey is noticeably darker, cooler.

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.