Jumma Prayer - Doing ghusl for Jumu’ahis prescribed as Sunnah when getting ready to go to the prayer

Does the obligatory ghusl done before Fajr exempt one from also having
to do ghusl for Jumu'ah, or not?
Majmoo' Fataawa wa Maqaalaat Mutanawwi'ah li Samaahat al-Shaykh
al-'Allaamah 'Abd al-'Azeez ibn 'Abd-Allaah ibn Baaz (may Allaah have
mercy on him), part12, p. 404