ΔE 21.0, loose: different enough that you should pick on purpose. War Master Green is noticeably lighter, more muted than Thunder Storm.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). War Master Green is noticeably lighter, more muted than Thunder Storm.
The same difference applies the other way round: Thunder Storm is noticeably 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 Thunder Storm on the colour wheel See War Master Green on the colour wheel
All matches: Thunder Storm equivalents · War Master Green equivalents