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Actually it's not a standard price for certain pair in all the exchanges.Because the price of all the cryptocurrency is based on the market demand and not based on the exchanges.In the exchanges like binance, we can get a good price for any pair because due to the huge traders using to inverse their money. The will be a competition between the buyers and it's easy to get good price for the pairs.
To think that there would be no competition if the price of those pair would be just the same in all sorts of platforms and as mentioned it will vary on each exchange
yet it all matters with the liquidity and volume.They wont really be on huge gap though because of possible arbitrage thing and its a rare case to happen.
They differ but only on minimal as possible.