SIAP: Are the Magnalite Classics different than the older models?

I have a mixture of Wagner Ware, GHC, and Magnalite Classic pots, roasters, and frying pans.

I've searched here and google to see if there was a clear distinction between the brands - besides owners. I'm curious if the quality of the Magnalite Classics are the same as the older Wagner or GHC models.

Any info on if the materials are the same, casting process is the same, etc... would be great.

If there's a thread on this, I searched and did not see anything specific.