Question about the H4 mask

The Question I have about the H4 Mask is if it was a 75 Kirk mask which on the dvd they claim it was a 75 Kirk, then why does it look so different? The hairline is not the same, even texture of the hair is different & the shape of the mask is also very different too. If it was a 75 Kirk it should look somewhat like the H1 mask. Can anybody explain this?
myers-h1.jpg
halloween-4 mask.jpg

Scroll down to H4 section.

Great info in the whole thread as well.

https://forum.michael-myers.net/t/the-definitive-guide-to-all-halloween-1-11-masks-boots-coveralls-and-knives-pic-heavy/55166/1

They styled the hair different, and the eye cuts are different, also dont qoute me on this but i beleive when they were painting the h4 kirk white to be a myers, they put the paint on very very thick, witch changed the features a bit.