Having used the CLC "Provisional Loadsheet" system for a significant number of years, in the VAST majority of cases you receive a message saying "Compliance with Issue x" where x is the issue number of the provisional loadsheet. The margin of error permitted is type dependent. For example, on the 777 the margin of error is +1000kg/-5000kg and +/- 2% of the MACTOW. Your performance calculations are based on this margin. If the final loadsheet, which is received via ACARS or radio, exceeds this margin ("Revisions to Issue x"), you recalculate the performance for the new figures.
In my experience, "Revisions" occur about one sector in twenty.