Hi:
EG and WRS are actually using different methods to generate the pie charts. If you want to surface your EG-created chart in WRS, you can create the pie chart in an EG task and then turn your EG task into a stored process. Then, in WRS, instead of making the pie chart using the WRS tools, you would run the stored process, which would use the EG method -- and you'd see the EG chart in WRS.
I do not believe you have control of the colors in WRS, so the EG method would also allow you to control the colors as well as put the percentages on the pie.
For more help on turning an EG task into a stored process, you might want to contact Tech Support.
cynthia