Is it not possible they are made by the same manufacturer but to different recipe specifications?
I only say that because I know the fudgesicles made here in Ontario for the Eastern Canada locations are very different in texture and flavour than the ones sold here in Ontario. When I first told my husband this he told me I was just remembering things differently from my childhood. On a vist to the east coast I insisted he try one and he now fully agrees they are made differently.
I wonder if this is not the case in a lot of different areas, i.e., I believe one company makes all the refrigerator innards and the only change is the outer shell which then has the company name put on.