- The paint you hear with the brush has not been diluted more than that applied with the roller.
- There is no good compatibility of the pigments with the color.
Applying paint with a brush generally leaves more paint on the surface than rolling. This offers more coverage so the shade looks darker.
Dilute the paint to be applied to the “cut” with a brush, more (eg 10% instead of 5-7% with water). Apply as thin a band of color as possible to the cuts.