That seems like a pretty unrealistic scenario. I guess it's a thought experiment but positioning (and the existence of branding/marketing) alone would indicate

That seems like a pretty unrealistic scenario. I guess it's a thought experiment but positioning (and the existence of branding/marketing) alone would indicate to me that Barry and Mark are not going to be exactly the same. Positioning is always going to be at the very least a soft-moat and especially in consumable goods it's going to be a pretty strong moat (think Coke vs. Pepsi).