That is entirely different.
Personally, I have never administered palliative sedation.
In general, medical assistance in dying is a rapid process that is meant for patients who are fully aware of their situation and their choice. Palliative sedation can be a patient's choice too, but it can also be administered when the patient is no longer conscious. Sometimes it is a family's choice.
I have administered medical assistance in dying much more. Ending their life this way is truly a patient's choice. Administering this care is entirely different.
I imagine that palliative sedation can be administered more in a context of palliative care. When the medication becomes insufficient, palliative sedation can be the next step in palliative care.
In the context of medical assistance in dying, at least in my experience, I imagine that the two practices could be interchangeable. The fact remains that the patient consciously chooses to receive medical assistance in dying. It is a specific moment during which the care is administered.
That is how I would summarize the question, although I have never administered palliative sedation.