Les Talens Lyriques

La grotta di Trofonio (Trofonio`s Cave) is an opera, described as an opera comica, in two acts (five scenes) composed by Antonio Salieri to an Italian libretto by Giovanni Battista Casti.
The work was first performed in Vienna, Austria at the Burgtheater on October 12, 1785. The similarity of the story of the opera may have influenced Lorenzo da Ponte when he wrote the libretto of Mozart`s Così fan tutte.

Synopsis:
Dori and Ofelia (sisters) are in love with Plistene and Artemidoro (friends). The two pairs have contrasting personalities: Dori and Plistene are extroverted and enthusiastic, Ofelia and Artemidoro are introverted and reserved. The magician Trofonio invites them to his magic cave where their characters are reversed, first the men and then the women. Eventually everything is sorted out and there is a happy ending.

https://it.wikipedia.org/wiki/La_grotta_di_Trofonio
https://en.wikipedia.org/wiki/La_grotta_di_Trofonio