Step back from the paint investigation for a minute and all the evdience and just ask yourself a couple of questions.
Why would Brock give the museum a car and tell them it was the 05 car, then sell the other car to John Farrell as the 25 car, then sell the same car onto John Clelland as the 05 car, then 20 years later vigorously defend that car as 05 when his mate buys it to put in a museum. Forget the whole arguement about which car is which for a moment, answer that question and you have your answer as to which car is which. Why do you think the log books never went with the cars?