I'll take your word for it either way.
Party liability is generally dealt with under section 21 of the Criminal Code for most offences, for example, for aiding, abetting, or encouraging an offence. There are different kinds of party liability. You can actively, just through words, encourage someone to commit a criminal offence, which seems to be parallel to paragraph 241(b), whereas the actual act of aiding, which is perhaps providing the life-ending medication to someone, goes beyond mere words of encouragement and actually plays a different role in bringing about the end of that person's life.
Either way, you get to that end result, which is liability under the Criminal Code, so those are just different expressions of party liability through different means.
I'm not sure if that helped clarify things.