In short no. Once a CE is implemented that is full and final. An under estimated rate does not constitute a new compensation event (and equally nor can the Employer have money back if rate was way over your actual cost).
The only way this would be a compensation event is if the actual quantity of this element changed significantly after it is implemented, but then only the element that is more than 0.5% of the total of the Prices would be subject to consideration.
The only way this would be a compensation event is if the actual quantity of this element changed significantly after it is implemented, but then only the element that is more than 0.5% of the total of the Prices would be subject to consideration.