If both users are using the same drive pathing, and if the user does have both C3D and Acad installs, then the data shortcut should resolve. Now, that's not to say it does, that's to say that the intent is that it should. If it doesn't, it's something we want to look at fixing.
Banner, please visit subscription support and file a support request. Make sure you put my name in the request so that the support guys know I'm chasing this down as well. I can't guarantee a fix, but I can at least have it on my radar.
Thank you,
James Wedding, P.E.