ΔE 11.7, fair: the same colour family, but not a straight swap. Meteor Rock is a little lighter, cooler than RLM 04.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Meteor Rock is a little lighter, cooler than RLM 04.
The same difference applies the other way round: RLM 04 is a little darker, warmer.
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 RLM 04 on the colour wheel See Meteor Rock on the colour wheel
All matches: RLM 04 equivalents · Meteor Rock equivalents