ΔE 7.3, close: similar, with a visible difference side by side. Kiwi Brown is a little lighter, cooler than XV-88.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Kiwi Brown is a little lighter, cooler than XV-88.
The same difference applies the other way round: XV-88 is a little 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 XV-88 on the colour wheel See Kiwi Brown on the colour wheel
All matches: XV-88 equivalents · Kiwi Brown equivalents