I'm speculating here, but I doubt anything major changed about the engine including the seals and gaskets. Further I'd say Ford just wanted to go to a longer life AF and G05/MC Gold HOAT filled the bill.
And while not back spec'd for the original green AF, I can think of no reason why MC Gold wouldn't work fine in those applications. Longer service life than original green, lower silicates and no worries about 2eha used in Dex and universal clones. I'd do a complete exchange if switching from OG to G05/MC Gold.