Hoplite Gold vs Bees Knees

How close are they?

ΔE 17.5, loose: different enough that you should pick on purpose. Bees Knees is noticeably lighter, more saturated than Hoplite Gold.

Can I use Bees Knees instead of Hoplite Gold?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Bees Knees is noticeably lighter, more saturated than Hoplite Gold.

Can I use Hoplite Gold instead of Bees Knees?

The same difference applies the other way round: Hoplite Gold is noticeably 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.