ΔE 23.6, loose: different enough that you should pick on purpose. Japan. Unif. WWII is a little lighter, much more saturated, cooler than Gyzmo Fur.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Japan. Unif. WWII is a little lighter, much more saturated, cooler than Gyzmo Fur.
The same difference applies the other way round: Gyzmo Fur is a little darker, much more muted, 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 Gyzmo Fur on the colour wheel See Japan. Unif. WWII on the colour wheel
All matches: Gyzmo Fur equivalents · Japan. Unif. WWII equivalents