Yes, we see that alot with many brands. Distributor changes and vendor changes often go along with new packaging graphics and what I call series names. For the maker, who may be Pioneer (or even another manufacturer in China usually ) this more generic packaging allows the item to be sold in many different commercial outlets. And a catalogue connumdrum for us! I noticed on these the 6 wheel dot sets the pattern holes are larger for both the tractor cab and trailer sets. That could be due to more chrome be used in the production runs between these two items.