ΔE 20.3, loose: different enough that you should pick on purpose. Engine Gray is noticeably lighter, cooler than Bad Bruise.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Engine Gray is noticeably lighter, cooler than Bad Bruise.
The same difference applies the other way round: Bad Bruise is noticeably 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 Bad Bruise on the colour wheel See Engine Gray on the colour wheel
All matches: Bad Bruise equivalents · Engine Gray equivalents