Hi I’m Bobert!
Assuming this does have the lineage no one in the know seems to want to step forward and state, what is being shown is NOT a "straight cast." The unaltered castings still have all the paint marks in them. What is being shown has undergone considerable cleanup. Different from the cleanup MinuteFett did, but similar in nature.
I agree that they're similar in nature and that there hasn't been any clarification. Yet, only one helmet is making these claims of being a directly cast from the hero, unless I'm mistaken?