It's easy to tell. But who wants to memorize all those combinations to be able to search and distinguish them? And how are you going to tell them apart? Thought so.
The real hardcore barcodes had the same avi/stats/showcase. And are you really going to keep a list of every single barcode in your notes? What if they change names/reset? And how do you tell them apart with other people ("barcode LiLLLiiiLiiLLLLL is farming me")?
If they reset they aren't much of a threat anymore are they? You will always have the gift or link and just click it. It's really quite easy. And if you needed too, sure why not keep a list of them in your notes.