In California the charge can be anything from vehicular manslaughter to second degree murder, that means 15 years-to-life without parole, depending on other factors such prior(murder) convictions or if the victim is a peace officer and so forth.
In comparison self-driving systems do not have any punishment mechanism in the penal code. There is not even a well established liability standard, or ban/suspension threshold or any regulatory body equipped to audit a self driving system specifically [2]
[1] if found guilty - we may disagree on the mechanisms, effectiveness ,conviction rate and other details, nonetheless there is enforcement and there are going people in prison for this type of crime everyday.
[2] yes NTSB can do investigations but only for accidents (and give recommendations) and also has just 400 employees and $150M budget to cover everything from aviation to marine or pipeline and rail accidents.