The molds for the mags have been permanently changed.
There are also many other changes in the polymer and metal in the newer mags.
There will never be more pre ban looking mags.
The guys and gals with pre bans - especially in new condition - own gold.
The laws will never change in Mass either.
The legislature won’t change the laws in Massachusetts regarding mags but the courts will. The California mag ban lost at the district court and circuit court of appeals level then was saved by an en banc panel which was then GVR’d by SCOTUS and its back with the district court which struck it down pre NYSRPA vs bruen.
Mag bans are going to be found unconstitutional and tossed, they will fall in Massachusetts too.