Luke is a modern-day child whilst Lulach belongs to medieval times.
Lulach is expected to follow in his stepfather's footsteps and become the chief of his village whereas Luke is just a normal boy who is not expected to continue his stepfather's work.
Luke is drawn into Lulach's world, but Lulach is not drawn into Luke's world.
Lulach ages at a different rate to Luke.
Similarities:
Both boys have a stepfather whom their mothers married upon the death of their real fathers
