The GUID's are not re-used in NS, even if you "nuke" it. There is a "Deleted Items" collection and your GUID is still there. May I suggest that the road this thread is taking would be a rather dangerous one? True, it might work, but I'd think there's a FAR better way!
1) The suggestion from George is a good one. Static collections are a bit awkward anyway and cause messes down the road. It's far easier to make things based on some kind of inventory or OU or something like that so that all you have to do is change a setting on the computer and bam - it's in all the right collections.
2) Since the collections a computer is assigned to shows up in Resource Explorer, it IS possible to essentially "clone" a set of collections from one computer to another.
Sort of.
Many of the collections a computer belongs to are dynamic, and you'd not be able to clone these - or rather, PLEASE don't do that. You'll make a huge mess of things if you do.
However, for your static collections, it wouldn't be too hard to build some SQL around those. ItemReference I believe is where you look for the linking between computers and their collections. I'd have to dig a bit more to really find it, and then you'd have to put in some sort of ... filter to determine if it's one of the ones you made vs one of the ones that are truly dynamic, but it's doable. I've done thigns "like" this before.
If you can't find the tables, let us know. My guess is someone here has those memorized, but I'm not "quite" that good. Yet. ;-)