Atleast for my eyes they look similar. These two beautiful swallowtail butterflies look very similar. Its hard to differentiate for a commoner.
Crimson Rose butterfly and Common Mormon butterfly.
Crimson rose – Scientific name – Pachliopta hectorIt is a red bodied, black butterfly with white spots on the fore wing and red spots on the hindwing.
Common mormon – Scientific name – Papilio polytesIt is a red bodied black butterfly with white stripes on the forewing , red and white spots on hind wing.
You can see my photos of other butterflies here