Terracotta Pie vs Bugman's Glow

How close are they?

ΔE 15.5, loose: different enough that you should pick on purpose. Bugman's Glow is a little darker, much more muted than Terracotta Pie.

Can I use Bugman's Glow instead of Terracotta Pie?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Bugman's Glow is a little darker, much more muted than Terracotta Pie.

Can I use Terracotta Pie instead of Bugman's Glow?

The same difference applies the other way round: Terracotta Pie is a little lighter, 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.