From what I read in the Cartographer_quests file(and what I tried on the Deadmines instance map using Cartographer), it tags the quest givers you go see as opposed to showing you what quests correspond with the instance dungeons. I could be wrong..
Nope, you're not wrong. I'm currently working on a knowledge base for Cartographer that will probably include the information you are looking for. The main problem is getting the data. :( If you have an Atlas Quest SV file you are willing to share, you can email it to me and I can see what kind of data I can build up. :)