If you are really into vintage denim then there are differences. Lee supposedly changed the number 101J in or around 70s to 200. I suppose if any company wants to recreate the 50s 101J they have to reproduce as close as possible the 101 denim, the blanket and the shape (the length of "101J" similar to the Levi's type 3 grew longer and longer over the years). For example, I have a LVC 557xx which is the repro of the first Levi's trucker. That comes before the more readily available 70s longer and more V-shaped 70505. I have both a nos 200 and a nos 200 Storm Rider from the 70s. They are nice jackets not flimsy like the current ones but they are longer than the 50s 101J and are made of 70s brighter colour denim. So I guess it depends on how obsessed one is with details.