Hi,
First, one thing I’m not clear about is that in your screenshot the charts have the same top position, but different bottom position.
I’m presuming that this is not the problem you are referring to, but nevertheless, can you send us your Excel file so that we can investigate it?
Anyway, if I understood correctly, you want to have the charts with different sizes but with the same plot area.
In other words, the drawing of a pie chart would be the same size but the legend would take more or less space.
Is that correct?
Unfortunately, there is no such option.
Only the entire chart’s size is constant, the plot area is affected by axes and legends.
The only suggestion I have for you is to create charts without a legend and then write the legend yourself in the cells below the chart.
I hope this works for you.
Regards,
Mario