ΔE 18.6, loose: different enough that you should pick on purpose. Inktense Red is a little lighter, much more saturated, warmer than Evil Sunz Scarlet. They are different kinds of paint: Citadel Evil Sunz Scarlet is an opaque base/layer paint and Scale75 Inktense Red is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Inktense Red is a little lighter, much more saturated, warmer than Evil Sunz Scarlet. They are different kinds of paint.
The same difference applies the other way round: Evil Sunz Scarlet is a little darker, much more muted, 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.
See Evil Sunz Scarlet on the colour wheel See Inktense Red on the colour wheel
All matches: Evil Sunz Scarlet equivalents · Inktense Red equivalents