Forms API - Understanding response

We are building a system to ingest Kustomer forms and showing it to our end customer. During development we noticed that the componentsV2.id was always unique across the forms and hence we built the logic based on it. Post deployment we noticed that for some of our customers componentsV2.id is not unique for multiple attributes. 
 

Can someone please help us to finding the correct unique key for the attributes in the form. Adding the fields that are repeated

'A6D21Q5ics4': {
    'id': 'A6D21Q5ics4',
    'componentAttributes': {
        'hint': '',
        'placeholder': '',
        'type': 'text',
        'label': 'Description',
        'name': 'messagePreview',
        'id': 'messagePreview',
        'description': '',
        'className': '',
        'required': true,
        'updateAttribute': true,
        'attributeProperty': 'preview',
        'attributeType': 'message',
        'isCustomAttribute': false
    },
    'componentType': 'kustomerText',
    'attributeProperty': 'preview',
    'attributeType': 'message',
    'isCustomAttribute': false
}

'A6D21Q5ics4': {
    'id': 'A6D21Q5ics4',
    'componentAttributes': {
        'hint': '',
        'placeholder': '',
        'type': 'text',
        'label': 'Some different label',
        'name': 'messagePreview',
        'id': 'messagePreview',
        'description': '',
        'className': '',
        'required': true,
        'updateAttribute': true,
        'attributeProperty': 'preview',
        'attributeType': 'message',
        'isCustomAttribute': false
    },
    'componentType': 'kustomerText',
    'attributeProperty': 'preview',
    'attributeType': 'message',
    'isCustomAttribute': false
}