The adults are different and belong to different categories.

1. Maggots are the eggs laid by flies, and bamboo insects are the larvae of bamboo wasps. Therefore, there is a difference between the adults of bamboo insects and maggots. The adults of bamboo insects are bamboo wasps and the adults of maggots are flies.

2. Maggot flies belong to the suborder Diptera and the order Hymenoptera, while bamboo insects belong to the order Hymenoptera of the family Apidae. Therefore, there are differences in the classifications of bamboo insects and maggots.