What is a central grammatical distinction between “qāma Zayd” and “Zayd qāma”?

Fronting the Subject: Restriction, Reinforcement and the al-Jurjani–al-Sakkaki Debate

• Zayd must be the object in both
• The first is negative and the second is performative
• The first is plural and the second dual
• The first is verbal; the second may be nominal with a verbal predicate