Fall term we had a similar assignment with a twist, in our History of Photography course. We were to select a 19th century and a 20th century image from the Rosenblum, "A World History of Photography" text (694 pages) and compare and contrast with a third image that we had taken and printed for our Fine Art photo course work. For our presentation all three images had to be scanned and put into one Power Point frame, blown up to about an 8x10 foot image on the classroom wall. We then had to present to the class and instructor for 5-10 minutes. Extemporaneous people fell on their faces.
You say you have chosen the Meyerowitz image and are bogging down finding a suitable comparison. Perhaps you are making the assignment more difficult than needed. Throughout the course our instructor and the book pointed to wonderful comparisons of all types. In studying for the final exam I searched "compare X (any significant image) to blank". Many comparisons came up that certainly added ammunition to the final exam essay questions.
The instructor has put you in control here. Pick two that are easy to work with because they have made a strong impression on you during the course. As they say, tongue in cheek, the paper will write itself.
Good luck,
John Powers