Yes, as seed is completely independent of the device and vice versa you can have the same exact seed active on 2+ devices at the same time.
This means, that even if your device gets misplaced and you recover your wallet to a different device, the first remains active (if protected by PIN, this shouldn’t be an issue anyway, but you may want to move your coins to a newly generated seed anyway.
Also, this means that you can have more devices active and use some of them as back up device.