I usually copy and paste the whole chart and change the dimensions and expressions to match the new chart. This way I get to keep all the formatting and other stuff which might change if I create a new chart or use paint brush.
You can copy the chart as it is ,But if your'e switching from straight to pivot or Pivot to straight means.Then may vary accordingly . If using same chart means you can change your dimensions and Expressions.
Then also your looking a change means. some how if your working with two QV environments or what?
your server ! and Personal edition , this means due to version change they may be variations in the chart at some point.