This requires you to supply the parameters: name of the sheet where the
charts are, desired width of the chart area, desired height, left offset of
the plot area (distance from left edge of chart area), top offset, width and
height of the plot area.
If you don't want to have to figure the parameters you could modify the code
to read the values from one of the charts.
Public Sub MakeSame(SheetName As String, CWidth As Double, CHeight As
Double, PLeft As Double, PTop As Double, PWidth As Double, PHeight As Double)
Dim CO As ChartObject
For Each CO In Sheets(SheetName).ChartObjects
CO.Width = CWidth
CO.Height = CHeight
With CO.Chart
.PlotArea.Left = PLeft
.PlotArea.Top = PTop
.PlotArea.Width = PWidth
.PlotArea.Height = PHeight
End With
Next CO
End Sub