No, those are different. You can clearly have a wish for something, but that doesn't necessarily imply that you have capacity or competence for it.
The other issue I'll point out is that capacity assessments—in medicine, we often call them that—are specific to what is being assessed. They're specific to the decision. Therefore, it's conceivable that someone can have capacity to make one decision and lack capacity to make a different decision. The capacity assessments for PAD requests need to be very focused on the nuances of what could be behind the process of making that specific decision.