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The URL to the survey does not change. Therefore, it should not matter unless they've already opened up the survey.
Did you change the order of the questions? Or did you do anything else structure wise to the form or try to move the columns in the spreadsheet? Finally, did you add a question? These things could be dangerous if done in combination with one another (not all of them are dangerous individually, so don't panic), so please make sure you ask questions about change making to ensure no loss of data or permanently wrecking the form.