Yes, they are all the same. When i do undock the only one that does dock, it just switches to the next one with the other 3 not docked. Does this over and over You just wait, i have another ship identical to the one i docked. That in tandem with the one you see will propel it with its nuke engines, On the bottom quad coupler (if i can get stuff to dock) will be a atmospheric plane for laythe, and the top will have either 4 probes (for a coms mod im thinking of installing) or a tug for the eventual station im putting in orbit around it. Go big or go home right? Thats what KSP taught me.