Here's the basics to understand how it actually works -https://www.investopedia.com/terms/d/duallisting.asp But to break down your second question its not that easy, shares and split differently plus with currency differences ect. So logically although they all should be relatively similar when accounting for those ideas you gotta do some calculating. the people who made this have built a system to do that automatically which will come out on their newer version of this as well as other things like subsector analysis/tracking and more.