# Get Recipe Version Changes

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Return a structural diff of ``version_id`` relative to ``compared_to`` (defaults to its parent).

``before`` holds values at the comparison point; ``after`` holds values at the subject version.
Only changed top-level fields appear in ``data.field_changes``; an empty map means the two
states are equivalent. For rollback preview, pass ``compared_to=\{current_head\}`` to see what
reverting to ``version_id`` would change. Diffing a version against itself returns 400.