The easiest non-programmatic solution:

Stack the two charts one on top of the other. For whichever is on top:
double-click each of the Plot Area and the Chart Area. In the
respective dialog box, from the Patterns tab, set the Area to None.

Now, size the two charts to achieve the desired effect / alignment.

Once done, position the charts as desired. For the chart that had the
plot/chart area set to none, reset the two area to the original.

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Regards,

Tushar Mehta
www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
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In article ,
says...
How could I size chart's plot areas equally, height and
width? Both charts have different series and categories.
- thanks.