can two people use the same pre-planned story for aqa creative writing?

hello all, this is very urgent. Me and a friend have worked together to create a pre planned story for the english language creative writing question (aqa). if the question goes well we will essentially be writing the same thing (with maybe a few sentences changed during the exam). we are the only people who will be using this pre-planned story. will we be questioned/disqualified for plagiarism? we will not be sitting near each other in the exam hall. thanks