A very broad recommendation such as “speak well” may recur without borrowing. But a shared ironic stance, unusual sequence of commands and distinctive conceptual turn amount to a more specific correspondence.
A workable comparison separates:
1. Identical or near-identical wording.
2. The particular thought expressed in each verse.
3. Whether the new vocabulary generates a new meaning or merely renames the earlier one.
This evaluates verbal change by its actual rhetorical effect.