The premise of your question I think might be based on answers given by the counsel at the Department of Justice—I apologize, but I don't remember her name—who seems to equate counselling suicide with physician-assisted death, whereas euthanasia would be more tantamount to murder. I don't agree with that characterization.
Physician-assisted suicide, if it runs afoul of the exception in Carter, is, in every conceivable way that I can think of, murder. It's a matter of crown discretion that a person is charged not with murder but rather with counselling suicide. In regard to aiding and abetting a murder, for example, to take it out of the physician-assisted suicide context, if a person provides the getaway car to someone knowing that they're specifically intending to kill somebody and they do then go on to commit that murder, the person who provides the getaway car is equally guilty of murder.