Michelangelo made the marble one but why did he do another if Donatello had already made one?

"Results": [
    {
        "TypeName": "PER",
        "Text": "Michelangelo",
        "Start": 0,
        "End": 12
    },
    {
        "TypeName": "PER",
        "Text": "Donatello",
        "Start": 62,
        "End": 71
    }
]