ΔE 14.1, fair: the same colour family, but not a straight swap. Deathclaw Brown is a little lighter, more muted than Mushroom Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Deathclaw Brown is a little lighter, more muted than Mushroom Brown.
The same difference applies the other way round: Mushroom Brown is a little darker, more saturated.
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 Mushroom Brown on the colour wheel See Deathclaw Brown on the colour wheel
All matches: Mushroom Brown equivalents · Deathclaw Brown equivalents