Yes, the left and right hotends have identical structures and materials, and can be used interchangeably.
Currently, simultaneous use of different-sized nozzles is not supported. If this feature is added in the future, we will provide information through a firmware update.
The separated nozzle goes well with the old hotend, and it is not compatible with our new and integrated hotend. So once the hotend is broken or has normal wear and tear, we highly recommend that you could consider the latest version of hotend and change it to the machine.