Arafat is an integral standing of Hajj, whereas Muzdalifah has an obligatory standing for which omission normally entails dam.
A missed Muzdalifah standing does not automatically invalidate Hajj. Conversely, failure to achieve the required standing at Arafat is not repaired merely by paying a sheep offering.
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Bab Jinayat al-Muhrim — Tawaf Purity, Missed Rites and Expiations (Part III)
Arafat is an integral standing of Hajj, whereas Muzdalifah has an obligatory standing for which omission normally entails dam.
A missed Muzdalifah standing does not automatically invalidate Hajj. Conversely, failure to achieve the required standing at Arafat is not repaired merely by paying a sheep offering.