lols firstly its most unlikely we are gonna have da same set of examiners and i can tell you the reason being that teachers that did the oral examination in that area are from schools around another area and you think about it, its the teachers are most likely from schools around my area or very far away areas and since your not allowed to examine in the same area as your school its most unlikely ill get the same set of examiners as Matt. Plus the time difference is alot its like 5-29 thats like 24 days ==. Also it doesnt matter, theres bound to be one other person that does the same topic as you, the teachers are not there to compare, they are there to judge your ability of speaking japanese no matter what the topic is...Also since the topic im doing has different aspects to it i might be able to provide something different.
Nevertheless, the only thing that would matter in the situation is the person RIGHT INFRONT of you does the same topic then you might have a bit of problem, that is why if you know your friend is doing the same topic as you trade rooms with someone else before your oral...(i dont think there are allocated positions for you just the times you have to be there)