Thunder Storm vs Semi Gloss Black

How close are they?

ΔE 13.6, fair: the same colour family, but not a straight swap. Semi Gloss Black is a little lighter, more muted than Thunder Storm.

Can I use Semi Gloss Black instead of Thunder Storm?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Semi Gloss Black is a little lighter, more muted than Thunder Storm.

Can I use Thunder Storm instead of Semi Gloss Black?

The same difference applies the other way round: Thunder Storm 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.