One need only glace at a copy of the RED BOOK FOR FRUIT JARS to see that there are so many mold variants for common jars. The book really is a necessity for a collector of jars.
I have been a bottle collector for many years but am by no means a jar expert. Not sure if the Good Luck jars were reproduced or not but my hunch is that you have found a mold variant.
Hope this helps.