How do Zaydun rākibun and jāʾa Zaydun rākiban chiefly differ?

Appendix to Faṣl and Waṣl: Circumstantial Clauses, Wāw and Pronominal Linkage

• Riding is the main assertion in both
• Riding is a main predicate in the first and a circumstance in the second
• Rākiban is the subject in the second
• The first has no predication