Product Number Variation

Occasionally the product number associated with a particular brand of pencil will change with time, such as when Dixon’s Ticonderoga 1386 became 1388. Usually this change is accompanied by an update in design.  But here are a couple of pairs for which only the number is different:  

I suspect that for these, the product number printed on the pencil depended on the manner in which it was sold, for example individually or in a packaged set.