The maps generated by using the same seeds are in fact the same. i saw in a video a person putting in the same seed as someone else, and he pressed f3, showing him the x,y,z numbers for the map. he matched them to the other persons and they were the same. of course i had to try it and i also ended up in the EXACT SAME place. this is a cool way to share your maps with your friends. <object class="emojione" data="https://resources.enjin.com/1489581540/themes/core/images/emojione/svg/1f642.svg?0" type="image/svg+xml" standby=":)">:)</object>

These seeds are based on a completley random database I think..