ΔE 4.4, very close: most people won’t see a difference side by side. IJA Earth Brown is a little darker, warmer than Reddish Grey.
Yes, for most jobs. Very close match (ΔE 4). IJA Earth Brown is a little darker, warmer than Reddish Grey.
The same difference applies the other way round: Reddish Grey is a little lighter, 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.
See Reddish Grey on the colour wheel See IJA Earth Brown on the colour wheel
All matches: Reddish Grey equivalents · IJA Earth Brown equivalents