If the board looks the same and there is no evidence of any modifications, they should be ok. Also, if it connects with genuine versions of Ledger Live that you downloaded from the official website and not a fake one that you were instructed to use with information in the package, it's a sign you are using a real Ledger. We are yet to see a fake/modified Ledger that can connect to Ledger servers, install the needed crypto apps, update the firmware, etc.