ΔE 10.9, fair: the same colour family, but not a straight swap. Phalanx Yellow is a little lighter than Meteor Rock.
✓ Army Painter Fanatic conversion chart lists these two as equivalents.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Phalanx Yellow is a little lighter than Meteor Rock.
The same difference applies the other way round: Meteor Rock 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.
See Meteor Rock on the colour wheel See Phalanx Yellow on the colour wheel
All matches: Meteor Rock equivalents · Phalanx Yellow equivalents