ΔE 10.6, fair: the same colour family, but not a straight swap. Transparent Burgundy is a little darker, more muted than Rebel Red. They are different kinds of paint: Army Painter Rebel Red is an opaque base/layer paint and Green Stuff World Transparent Burgundy is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Transparent Burgundy is a little darker, more muted than Rebel Red. They are different kinds of paint.
The same difference applies the other way round: Rebel Red is a little lighter, 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.
See Rebel Red on the colour wheel See Transparent Burgundy on the colour wheel
All matches: Rebel Red equivalents · Transparent Burgundy equivalents