I think how the text uses dramatic irony with the use of dramatic adjectives and other describing words. (sorry if I'm wrong I'm just not that smart)
A Subject verb disagreement is when you use the plural-form of a verb for a single form noun: Example: "the fox play" is disagreement because the plural form 'play' is used for singular noun fox.
Answer:
they are both teenage boys from the same city. they are different by their appearance.