Do butterflies look the same on both sides?

Butterflies have very different patterns on the upper and undersides of their wings. Look at the photos below to see one example. Also, just as with people, the right and left halves of butterflies are not exactly the same.

Polygonia_comma.jpg
Dorsal view
Eastern Comma (Polygonia comma)
Polygonia_comma3.jpg
Ventral view
Eastern Comma (Polygonia comma)

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