What is the difference between Pitra Dosh and Kaal Sarp Dosh?

Pitra Dosh is an ancestral affliction from unfulfilled Shraddha duties, reflected through the Sun and Rahu relative to the ninth house. Kaal Sarp Dosh forms when all seven visible planets fall between Rahu and Ketu. Both can cause suffering in similar life areas but have different causes and different remedies. The two can coexist and reinforce each other, particularly when Rahu also conjuncts the Sun — in such cases both doshas need to be addressed through their respective rituals.