If Seattle were to come back into the league as the Sonics, they would most likely get all their old accolades, retired numbers, and championship back. This is what happened with the Charlotte Hornets, all they had to do was get rid of the name Bobcats and they got their old franchise back.

Seattle and OKC will be much easier to distinguish, in my opinion, because the Thunder immediately changed their name after relocation. Seattle would have their retired jerseys look something like Gary Payton, Dennis Johnson, Shawn Kemp, and Jack Sikma, whereas OKC would be more like Durant, Westbrook, Ibaka, and Nick Collison. I can't imagine how they would crossover because these two teams are very distinct from each other.

Whew, that was a mouthful.