To compare results from different campaigns, used the 'Search' or 'Sort' function in Results Analyser to find the campaigns you are interested in. For instance, if you want to compare an EOFY campaign from this year compared to last year.
You will be able to find the campaigns you're looking for using the Campaign Name. For now, you will need to open both campaigns separately to compare the results.
In future, Dataro is planning on building a direct comparison tool so you can see year-on-year performance for you regular annual giving programs (e.g. annual appeals).