ΔE 11.9, fair: the same colour family, but not a straight swap. Royal Purple is a little lighter, more saturated than Gloss Seablue FS151042.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Royal Purple is a little lighter, more saturated than Gloss Seablue FS151042.
The same difference applies the other way round: Gloss Seablue FS151042 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 Gloss Seablue FS151042 on the colour wheel See Royal Purple on the colour wheel
All matches: Gloss Seablue FS151042 equivalents · Royal Purple equivalents