No, basically there are two major changes. you can follow this guide here

1. Authentication: for python you can follow this code to get TOKEN

   def get_access_token():
    """Get an access token from the service account."""
    credentials = service_account.Credentials.from_service_account_file(
        FIREBASE_CONFIG,
        scopes=["https://www.googleapis.com/auth/firebase.messaging"]
    )
   
    # Refresh the token
    credentials.refresh(Request())
    return credentials.token
   

   Replace FIREBASE_CONFIG with path to serviceAccountKey.json file

2. To send FCM messages via post man

   • URL is now changed to https://fcm.googleapis.com/v1/projects/{PROJECT_NAME}/messages:send

   • Set header Authorization: Bearer {TOKEN}

   • Add Payload

     {
         "message": {
             "token": {DEVICE_TOKEN},
             "notification": {
                 "title": "Test Notification",
                 "body": "This is a test notification with an image."
             },
             "apns": {
                 "payload": {
                     "aps": {
                         "mutable-content": 1,
                         "sound": "default"
                     }
                 }
             },
             "data": {
                 "image": "https://www.equitytool.org/wp-content/uploads/2015/06/SmallSample.png"
             }
         }
     }
     

     Replace DEVICE_TOKEN with FCM device token, mutable-content:1 is set to invoke NotificationServiceExtension in iOS.
     To send multiple deviceTokens, you can make use for multicast endpoint