Yes, The only difference is SMP1 has the Graveyard (It's were all the banned people go), SMP2 has the Park, Which is well, A park and SMP3 has an amusement park.
Basically yes, all the towns are set out in the same way although there are different seeds for the wild. However: something you build on SMP1 wont be on SMP2 - only naturally generated things are the same, not player made.