ΔE 12.9, fair: the same colour family, but not a straight swap. Temple Guard Blue is noticeably lighter, more saturated, cooler than IJN/IJA Aotake.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Temple Guard Blue is noticeably lighter, more saturated, cooler than IJN/IJA Aotake.
The same difference applies the other way round: IJN/IJA Aotake is noticeably darker, 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 IJN/IJA Aotake on the colour wheel See Temple Guard Blue on the colour wheel
All matches: IJN/IJA Aotake equivalents · Temple Guard Blue equivalents