I kind of seriously doubt that either autopsy report will be the deciding factor in a trial.

There is no disputing the video evidence that Floyd complained he could not breathe, that he lost consciousness, that Chauvin continued to use the force that caused Floyd's complaint and loss of consciousness for almost three more minutes and that Floyd dies as a result. It isn't going to matter a whole lot to a jury. Regardless of pre-existing medical conditions, Floyd was in custody, handcuffed and under control of the arresting officers. At that point, his welfare was in their hands. They had assumed control of him and the situation and it sure as hell looks like they failed to exercise due care with Floyd's life. Did he die from a heart attack, an aneurysm burst, a stroke or whatever, the cause will almost certainly be judged to be the application of force causing whatever it was that killed him. That is certainly going to be one of the prosecution's arguments. The prosecutor will be able to find a doctor willing to state that had Floyd been released the first time he said he could not breathe he would be alive now.

What the jury brings into the courthouse with them will likely be every bit as determinant as the evidence presented to them.