When two verses resemble one another, comparison proceeds in stages:
First: Identify the shared purpose and ask whether it is conventional.
Second: Identify the method of indication: is the simile, allusion, argument or distinctive scene also shared?
Third: Compare wording and arrangement: is the text copied, partly revised or wholly reworded?
The stages first distinguish what is common from what is distinctive, then classify the kind of taking. Starting only from similar end words misses the larger analysis.