Looking at your @yung_flynn comparison photo, it's interesting that the 1947 pair has lightning and roping on the top edge, but really no puckering on the outside seams under the rivets. The Warehouse pair below (not sure which model, but maybe one that you mention?) has puckering on the outside seams, but no roping or lightning from the top edge.
I can confirm this with the pairs I have. From left to right Warehouse S1000XX, Denime 220A, Warehouse 800 and Warehouse 1947 Duck Digger - all in different states of wear (obviously). The denims used for the pocket and coin pocket in S1000XX, 220A and 800 have denim facing the same direction and show what I mention above as having puckering on outside edges, but a pretty flat top edge with no roping / lightning. The 1947 (although mine are hardly worn) has perpendicular overlapping denim (as you also state) and I can see some tension from the top edge that may lead to the lightning and roping. I think @Dr_Heech is right that shrinking plays a huge role; as the denim shrinks in different directions and pulls at the coin pocket differently throughout, it's going to inherently cause different results when it comes to fading, puckering, roping, lightning, etc.