But it gets a bit messy since the Y axis must accomodate different prices, maybe there is a method to solve this but i'm not aware of it.
Just click on the scale on the top left of the chart "compare or add symbol"
in addition to that you can always export the points (data) from these sites into an excel spreadsheet usually in form of a .CSV file and then use that to do any kind of analysis you want on them. you can even add USD values to these charts and change the chart type to anything you like since you have a lot more flexibility in excel.
Could you get me some step-by-step procedures for how to import chart data into Excel sheets. I'm looking into youtube gave but I'm not finding exactly what I am looking for.