I purchased a woodland mansion map from the local cartographer and the cartographer still offers to sell me those maps. I assume that when I use the map for the first time, it will show me the way to the nearest woodland mansion and that if I have multiple maps I have to make sure I don't open a second map from the same general area or it will lead me to the same target. Is that correct? If so, how far do I have to travel to make sure that I will be led to different woodland mansion when I open another of these maps? Same question goes for ocean explorer maps.
For the reason above, explorer maps obtained from one cartographer will always be the same. Also, if two cartographers unlock the explorer map trades approximately at the same place and the same time, the map locations will usually be identical.