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Duplicate personalization variables will have a _Xnumber appended to the tag
If a personalization is created with this json body:
{
    "personalization": {
        "tag": "brand new tag",
        "name": "brand new name",
        "format": "text",
        "content": "Hello World!",
        "listids": "2,3,4,5"
    }
}
... but the tag brand new tagalready exists, the API response below shows how a personalization variable will be created, but will have a underscore and a number appended to the tagend:
{
    "personalization": {
        "tag": "brand-new-tag_1",
        "name": "brand new name",
        "format": "text",
        "content": "Hello World!",
        "listids": "2,3,4,5",
        "userid": "1",
        "links": [],
        "id": "12"
    }
}