Mostly the same.

If you are using google authenticator AND the binance application on the same device, you are not secured by a 2-factor-authentication. 2FA implies two devices.

This all depends on how much money you have on the exchange, the risk you are willing to take and your habits regarding security/safety on your mobile phone (shady applications, general permissions, ...).

Overall i would NOT risk any coins on an exchange (which by the way shouldn't be on an exchange anyway) by using it together with my GA on my mobile.