That can't be, right? I mean the same company can't sell the same item under two different names for two different prices, at least you couldn't 20 years ago when I worked for company that sold lots of "stuff". That was illegal for us to do so. Our products had to be demonstrably different.
This came up in another thread a while ago on the real difference (other than marketing) between regular M1 5W-30 and EP 5W-30. IIRC the conclusion was that they're the same oil.