My frustration is mounting regarding this. They should really dummy-proof this. I'm trying to play this with my wife, but we don't have the exact DLC packages. Can I just say for the record, this little minor detail needing to have the same DLC is ridiculous. There should be a way that it tells me exactly what I need to be able to play with the other person. If I look at it and decide it isn't worth spending them money to play with the other person, then that is my choice to make. On a side note, why all the DLC? Why not just include it with the game that people had paid $65 for?
If there is an easier way that you may know, please feel free to share it with me as I feel rather inadequate to solve this perplexing problem.