Are there any potential problems with running distinct Oracle rman archivelog backups of the same database at the same time? The scenario is that RMAN archivelog backups are scheduled to tape (TSM) every 2 hours. The scheduling ensures that such backups are run in a mutually exclusive fashion.
A separate crontab based mechanism has been put in place (by an unrelated team) with the result that "identical" RMAN archivelog backups are sometimes run at the same time.

Are there any potential problems with this, as regards to subsequent restore operations?
Normally RMAN takes care of this. It will only make a backup of the archivelog files of which it does not have a backup.

The restore just reads the archivelogs that it needs from tape.