Graph differences between resource and dashboard

I'm not sure if this is a bug or a feature enhancement.

An overview graph in the resource view includes data for instances of an data source that previously existed (which is super useful for A/B comparison!).  However, the the "Add to dashboard" option is used to add the graph to a dashboard, the graph only shows the current instance's data.  Please make it so that when the graph is added to a dashboard, that the dashboard copy also shows the data for the previous data source instances, as this is what our users expect when they do this.