Execution cocktails are very very different from what is given during ethical euthanasia, and they’re genuinely horrific.

Further, even with euthanasia, a good amount of sedative and a lethal amount of medication varies from person to person with age, race, gender, weight, and so on taking a very important role in the calculations. Doctors during executions have been known to be lax and negligent, sometimes purposeful, sometimes not, but no one cares because the person is slated to die anyways, further the person is meant to be sedated but conscious oftentimes. During euthanasia it is meant to occur under general anesthesia, or full sedation and sleep.