Yes, changes to the RBS tablespace are just like any other (more or less). They are logged to your redo log files.

By dedicating a couple of devices to your redo logs, you can minimize the impact of LGWR. If your LGWR is spinning all the time, you may want to check to see if LGWR is checkpointing too much (Checkpoint not complete message in alert.log) or you may need to tune your redo activity.