At Arafat on 9 Dhu al-Hijjah: Dhuhr and Asr are combined during Dhuhr time, with one adhan and two iqamahs.
At Muzdalifah that night: Maghrib and Isha are combined during Isha time (delayed combination), with one adhan and one iqamah in al-Quduri’s wording.
Both involve combining prayers, but the prayers, timing, and prescribed calls differ.