are the shares readily transferable between Aust and Canada? if...

are the shares readily transferable between Aust and Canada? if not, there is no arbitrage so there may be discrepancies...usually shuch shunting across markets is a fiddly business and not without risk as there are delays, the transfer is not instantaneous, best left to banks who can borrow stock to protect themselves.

Eventually you would expect prices to gravitate close to one another.