ΔE 13.6, fair: the same colour family, but not a straight swap. M495 Light Gray is noticeably darker, cooler than Trollblood Highlight.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). M495 Light Gray is noticeably darker, cooler than Trollblood Highlight.
The same difference applies the other way round: Trollblood Highlight is noticeably 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 Trollblood Highlight on the colour wheel See M495 Light Gray on the colour wheel
All matches: Trollblood Highlight equivalents · M495 Light Gray equivalents