I forgot that the default Blender AgX config actually sets hue restoration to 40%. With that applied:
dt with Blender primaries; Blender; dt with ‘my’ primaries:
The diffs:
dt-with-blender-primaries vs Blender:
dt-with-kofa-primaries vs Blender:
Applying a histogram stretch in Gimp (same stretch value of 30):
dt-with-blender-primaries vs Blender:
dt-with-kofa-primaries vs Blender: