Pareto curve vs Pareto chart
The only relation I see is that they are both named after Vilfredo Pareto. The Pareto curve is related to efficiency, and I see no way of connecting the Pareto chart to the same concept. Since Pareto was an engineer before becoming an economist, it seems most likely to me that its just that two distinct techniques from two different fields were named after him. I suppose you could use a Pareto chart as a tool to make efficient engineering decisions, so they are minimally related.