ΔE 18.0, loose: different enough that you should pick on purpose. Mars Yellow is a little lighter, more saturated than XV-88.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Mars Yellow is a little lighter, more saturated than XV-88.
The same difference applies the other way round: XV-88 is a little darker, more muted.
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 Mars Yellow on the colour wheel
All matches: XV-88 equivalents · Mars Yellow equivalents