Were the french librettos of The Tales of Hoffmann and Le prophète written by the same person?
no
Le prophète
Le prophète ("The Prophet") is a grand opera in five acts by Giacomo Meyerbeer.
 The French-language libretto was by Eugène Scribe and Émile Deschamps, after passages from the "Essay on the Manners and Spirit of Nations" by Voltaire.
 The plot is based on the life of John of Leiden, Anabaptist leader and self-proclaimed "King of Münster" in the 16th century.
The Tales of Hoffmann
The Tales of Hoffmann (French: Les contes d'Hoffmann ) is an "opéra fantastique " by Jacques Offenbach.
 The French libretto was written by Jules Barbier, based on three short stories by E. T. A. Hoffmann, who is the protagonist of the story.
 It was Offenbach's final work, as he died a year before the premiere.
Jeanne-Anaïs Castellan
Jeanne-Anaïs Castellan (real name Jeanne Anaïs Castel or Chastel), born in Beaujeu, Rhône on 26 October 1819, died in Paris 1861, was a French soprano.
 She is most notable for creating the part of Berthe in "Le prophète" by Meyerbeer. Gustave-Hippolyte Roger
Gustave-Hippolyte Roger, born in Paris on 17 December 1815 and died there on 12 September 1879, was a French tenor.
 He is best known for creating the leading tenor roles in "La damnation de Faust" by Berlioz in 1846 and Meyerbeer's "Le prophète" in 1849. The Tales of Hoffmann (film)
The Tales of Hoffmann is a 1951 British Technicolor film adaptation of Jacques Offenbach's opera "The Tales of Hoffmann", written, produced and directed by the team of Michael Powell and Emeric Pressburger working under the umbrella of their production company, The Archers. Maurice Léna
Maurice Léna (24 December 1859 – 31 March 1928) was a French dramatist and librettist of the Parisian Belle Époque.
 His opera librettos include Jules Massenet's "Le jongleur de Notre-Dame" (1902), Georges Hüe's "Dans l'ombre de la cathédrale" (1921), Charles-Marie Widor's "Nerto" (1924) and Henry Février's "La Damnation de Blanchefleur" (1920). Cléon Galoppe d'Onquaire
Pierre Jean Hyacinthe Adonis (or Antoine) Galoppe d'Onquaire (April 16, 1805 (Montdidier) – 9 January 1867 (Le Vésinet)) was a French writer and playwright.
 Among his operetta librettos, Jean-Baptiste Weckerlin's setting of "La Laitière de Trianon", "opéra de salon en 1 acte" is the best remembered, along with one song "Ça fait peur aux oiseaux" from the operetta "Bredouille", set to music by Paul Bernard (composer). Carlton Gauld
Carlton Gauld (before 1931 – after 1960) was an American operatic bass who had a prolific career during the 1930s through the 1960s.
 Raised in Bedford, Indiana, Gustos first rose to prominence at the Metropolitan Opera in New York City, making his debut with the company in the 1931–1932 season as the King of Egypt in Giuseppe Verdi's "Aida".
 He made his debut with the Teatro Colón in Buenos Aires in 1932, shortly followed by his European debut at the Opéra Comique as Nilakantha in Delibes's "Lakmé".
 He remained at the Opéra Comique for three years, portraying a variety of roles like, Basilio in "The Barber of Seville", the title role in Giacomo Puccini's "Gianni Schicchi", the Prior in Massenet's "Le Jongleur de Notre Dame", de Grieux in "Manon", Lothario in "Mignon", Ramon in Charles Gounod's "Mireille", the four villains in "The Tales of Hoffmann", Count Almaviva in "Le nozze di Figaro", and Scarpia in "Tosca" among others.
 He also sang in the world premiere of Emmanuel Bondeville's "L’École des maris" (1933) with the company. Mahomet (play)
Mahomet (French: "Le fanatisme, ou Mahomet le Prophète" , literally "Fanaticism, or Mahomet the Prophet") is a five-act tragedy written in 1736 by French playwright and philosopher Voltaire.
 It received its debut performance in Lille on 25 April 1741. Ernest Guiraud
Ernest Guiraud (] ; 26 June 1837 – 6 May 1892) was a French composer and music teacher born in New Orleans, Louisiana.
 He is best known for writing the traditional orchestral recitatives used for Bizet's opera "Carmen" and for Offenbach's opera "Les contes d'Hoffmann" ("The Tales of Hoffmann").