Yes, there is a site where you can look at how two stocks performed and enter their respective weight historically. One example is Yahoo finance.
Yahoo Finance provides hours of live, daily market coverage, as well as expert commentary and real-time market data, all within the app.
It's for astute investors, financial experts, and business executives who take their money seriously.
Create and manage your own portfolio and watchlists in Yahoo Finance.
Keep track of your possessions and keep an eye on potential investments.
It also has a currency converter - You can use the Yahoo Finance currency converter to compare and convert currencies.
It can also be used to view exchange rate charts and relevant news.