Using the same seed, seem to give the exact same map, but not the same spawn point. The only way I find to have the exact same start again, is to set the "Random respawn radius" to 0 in the world setting the 2 times. So, when you play with huge spawn distance like in wilderness survival the seed is pretty much useless.. Workaround, If you really want, you can take your coordinate and use the command tp for going to this at the start.