Which important detail also was not in the original question. What was in there was: I essentially want to store one variation of the content in my database,

Which important detail also was not in the original question. What was in there was: I essentially want to store one variation of the content in my database, with references to altered variations of the content, but I need to be able to detect the altered data. For which a "diff" style algorithm is a possibility, just storing the "alterations". Your update edit changed your question to be one for a different problem. For this goal-post move, you'll want to look into plagiarism detection algorithms.