If your AA flight is to YUL and your WS flight is departing from YHZ, I don't see how that would be an interline connection. If you have to check in with WS at YHZ and you aren't connecting to AA at FLL (I presume), I don't see why WS baggage rules likely would not apply (so definitely 2 bags, but I don't think you'd get 32kg).
https://otc-cta.gc.ca/eng/publicatio...pretation-note