Are Hellman's mayonnaise and Best mayonnaise the same exact thing?

In the thirties Best foods (which was popular on the west coast) bought Hellman’s (which was popular on the east) the dividing line is the Rockies. My understanding is that they are the same recipe but it was decided that they didn’t want to screw up the branding. I live on the west coast and would be disturbed if Best Foods vanished and was replaced by Hellman’s. And back then they didn’t have TV to advertise the fact that they are the same thing.

And actually, here in the Rockies you can find both Hellmanns and Best. Kinda strange.

From the Hellmann’s website:

“Hellmann’s® is known as Best Foods® west of the Rockies.”

FYI, pumas, catamounts, mountain lions, panthers, and cougars are all the same exact thing too.

When I was a little kid in NY state in the fifties, the jingle went like this:

The whole egg, the whole egg, the whole egg goes into Hellmans’ real mayonnaise.
Hellman’s is so good so many ways,
Cause Hellman’s is the whole egg mayonnaise! Cluck Cluck it’s good!

I thought you would all want to know this.

And Butternut bread out here is known as Weber’s. And Edy’s Ice Cream is called Dryer’s. McCormick seasonings used to be called Schiling out here as well. Forget about finding a good Canfield’s pop, though. We former Chicagoans need to unite!!!

By the way, would you please tell me how to make a jar of any other brand of mayonnaise taste like Hellman’s?