Drywall repair guide
New compound and an older painted wall absorb coatings differently. Sheen, color age and directional lighting can expose a repaired spot even after the surface is smooth.
What to discuss before work starts
Ask about primer and whether painting the entire wall or ceiling plane would create a more consistent result. Exact invisibility should not be assumed.
Put the scope in writing
Confirm the affected surface, repair method, finish boundaries, room access and any separate work before scheduling. The condition of concealed material can change what is needed.