can not
The charging interface to both phones is a TYPE-C (USB) interface,
However, oppo A11 mobile phone can not use the charger of oppo reno4,
The reason is that the oppo A11 original charger has a DC output of 5V\/2A,
Power: 10W, and the oppo reno4 original charger DC output: 5V\/2A or 10V\/6.5A
This power is: 65W, so the oppo A11 phone does not support.
Yeah, it's all oppo. It works