Old Rose vs Bugman's Glow

How close are they?

ΔE 19.5, loose: different enough that you should pick on purpose. Bugman's Glow is a little darker, warmer than Old Rose.

Can I use Bugman's Glow instead of Old Rose?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Bugman's Glow is a little darker, warmer than Old Rose.

Can I use Old Rose instead of Bugman's Glow?

The same difference applies the other way round: Old Rose is a little lighter, cooler.

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.