This is highly unlikely due to the design of the commit algorithm. The probability is less than 1.47 in 10^48. Digging into this, the commit id is actually a 40-character hexadecimal number - using a cryptographic hash function (SHA-1 or SHA-256 in newer versions) producing 2^(4*40) possible hashes.
Metadata that's fed into the cryptographic hash function include snapshot of the project tree (folders, files and contents), commit message, the commit data itself, author information and timestamp (time elapsed in seconds since Jan 1, 1970).
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