Suppose “pen, lamp” is followed by “writing, light.” The sequence of predicates matches the original order, illustrating ordered nashr. If it becomes “light, writing,” the first predicate belongs to the second referent and vice versa.
The labels ordered and unordered do not themselves establish a sentence's truth or rhetorical superiority. Either pattern can work if the pairings are intelligible and the altered sequence creates no real misunderstanding.
The later member need not repeat the name of its referent: ordinary knowledge can supply the clue by which the audience identifies the correspondence.