Can API-Keys of Two Exchanges Be Imported Under One Account?

No, it is not supported!

In order to make it easier for traders to understand and avoid confusion, the same uTrading account does not support importing API-Keys of two exchanges at the same time.

If you want to change the exchange, you must first stop all running robots, delete the API-Key of the current exchange, and then re-bind the API-Key of the new exchange.