ΔE 9.1, close: similar, with a visible difference side by side. Transparent Red is more saturated than Evil Sunz Scarlet. They are different kinds of paint: Citadel Evil Sunz Scarlet is an opaque base/layer paint and Green Stuff World Transparent Red is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Transparent Red is more saturated than Evil Sunz Scarlet. They are different kinds of paint.
The same difference applies the other way round: Evil Sunz Scarlet is 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 Evil Sunz Scarlet on the colour wheel See Transparent Red on the colour wheel
All matches: Evil Sunz Scarlet equivalents · Transparent Red equivalents