Hi Christopher,
Thanks, are you referring to two disk files? That could be compared easily, but because ABAP sources don't live on the local drive, a native comparison would have to be specifically provided by ADT.
Sure a download and compare of text is feasible, but as per my answer to Gregor, it's not worthwhile if it's more effort than alt-tabbing over to an SE39 compare in the SAPGUI.
It just strikes me as odd that ADT provides a quick and useful tool to compare versions but not alternate reports...
Thanks & regards,
Mike