I don't think it's the same storyline. I think there's a very intentional parallel between Sansa in seasons 1/2 and Sansa now. But I think the point of the parallel story is to highlight the differences, not the similarities.
Sansa has grown. She's no longer the naive, spoiled child she was in earlier seasons. She's trying to act -- to influence Theon, to sow discord among the Boltons, to thwart Myranda. She stole a knife (or whatever it was). Even just coming to Winterfell was ultimately her choice.
Granted, her actions have not been particularly successful -- yet. But she's taking initiative, and that's far different than early seasons Sansa. We still have plenty of time to see how it plays out.
