ΔE 28.5, loose: different enough that you should pick on purpose. Black Templar is noticeably darker, much more muted than Satchel Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Black Templar is noticeably darker, much more muted than Satchel Brown.
The same difference applies the other way round: Satchel Brown is noticeably lighter, much 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 Satchel Brown on the colour wheel See Black Templar on the colour wheel
All matches: Satchel Brown equivalents · Black Templar equivalents