«زيد قائم» is a nominal sentence whose predicate is an active participle; «زيد قام» contains a verbal-sentence predicate. Both attribute standing to Zayd, but the mechanism of predication and the account of reinforcement are not identical.
The same distinction helps analyze «رجل قائم» and «رجل قام». The discussion considers the governing force of the participle, its pronominal reference, and the resumptive element of a sentence, as applicable.
A rhetorical conclusion may be supported by grammatical form, but a resemblance between two constructions is not enough to erase their syntactic differences.