Very hard to answer you because unless you post the marking criteria or you know the marking criteria, difficult to make a reliable judgment, but probably the maximum mark you could get is 3-4-but that again depends on how you structured your response and what you wrote in your response, because although you may not have said similarly, you may have used other words to compare/relate/differentiate the two texts-so wait until you get your mark back, and stop being worried-keep studying for your other tests, make sure to read the question more carefully the next time around and you will be fine
hoped this helped