ΔE 10.6, fair: the same colour family, but not a straight swap. Amphora Red is a little darker, cooler than Rifle Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Amphora Red is a little darker, cooler than Rifle Brown.
The same difference applies the other way round: Rifle Brown is a little lighter, 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 Rifle Brown on the colour wheel See Amphora Red on the colour wheel
All matches: Rifle Brown equivalents · Amphora Red equivalents