ΔE 15.9, loose: different enough that you should pick on purpose. Boot Strap Brown is a little lighter, much more muted than XV-88.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Boot Strap Brown is a little lighter, much more muted than XV-88.
The same difference applies the other way round: XV-88 is a little darker, much 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 XV-88 on the colour wheel See Boot Strap Brown on the colour wheel
All matches: XV-88 equivalents · Boot Strap Brown equivalents