Yeah that makes sense, tyyIve never seen anyone get marked down for using the same case study, theres no problem using mcdonalds for ur whole thing. Either way u can just change Mcdonalds to Hungry Jacks and talk about the exact same thing ykwim. HSC or even school markers honestly dont care enough to cross check ur case study, personally I make it up in the exam cause then I can lie according to the question if that makes sense...