I would not call it schnappen in the way hanging parry oberhaw riposte is usually done. That is, with a larger motion to the opposite side. My interpretation of a schnappen is that you close the line while cutting around your opponent’s sword from a bind. To fulfill that requirement the hanging parry riposte should be done so that your hands and sword stay in close proximity to your opponent’s sword and you are able to close the line or even stay in contact with the sword. As such you could do a schnappen from a hanging parry but the common way of doing a hanging parry riposte is not a schnappen in my opinion.
I would not call it schnappen in the way hanging parry oberhaw riposte is usually done. That is, with a larger motion to the opposite side. My interpretation of a schnappen is that you close the line while cutting around your opponent’s sword from a bind. To fulfill that requirement the hanging parry riposte should be done so that your hands and sword stay in close proximity to your opponent’s sword and you are able to close the line or even stay in contact with the sword. As such you could do a schnappen from a hanging parry but the common way of doing a hanging parry riposte is not a schnappen in my opinion.