Yes, as it stands now, there is no real difference, but if this idea was implemented, don't you think they'd make it so there was a difference? You have to look at the bigger picture.... like I said, in terms of realism, you should have the option to reuse the craft. Look at it this way, you design a ship (Lets say a shuttle) and save it. Now you make and launch a total of 5 shuttles and you decide to give them the names of real shuttles like Atlantis, Challenger, Discovery and so on. When you land one of the craft back on Kerbin, it would make more sense to reuse it, rather than scrap it, load up another one, and name it Atlantis again. And like I said several times already - it will give the game more depth as craft develop histories and players grow attached to the craft that have seen a lot of service. They might be just a collection of pixels on a computer screen, but people will grow fond of their craft, the same way Warcraft players grow attached to their characters and so on. Having a craft that has seen a lot of service will be more devastating to the player over a craft that is just going to be scraped at the end of its mission.