Sure, it is possible. Already the price of each digital currency is different in each exchange. It isn't possible to have the same price in all of them, because the demand-supply determines the price and accordingly, the price is different in every exchange.
This is called ''scalping'' and is a way to make some profit. But, the prices are always variable, that's why earning is risky with scalping.
The price difference between exchanges is called arbitrage. That is a risk free profit but you have to be careful about
liquidity on both exchanges, transaction time and fees, deposit and withdrawal fees.
Scalping is a trading style in taking profits on small price changes.