ΔE 11.8, fair: the same colour family, but not a straight swap. Transparent Yellow is a little lighter, more saturated than Ochre Clay. They are different kinds of paint: Army Painter Ochre Clay is a one-coat contrast-style paint and Pro Acryl Transparent Yellow 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 12). Transparent Yellow is a little lighter, more saturated than Ochre Clay. They are different kinds of paint.
The same difference applies the other way round: Ochre Clay is a little 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.
See Ochre Clay on the colour wheel See Transparent Yellow on the colour wheel
All matches: Ochre Clay equivalents · Transparent Yellow equivalents