Ford and International header gaskets are indeed different, and won't work. It's not the quality of the Int'l gasket, but that it was designed for a different setup. The angle on Ford oil cooler is different than on the 444 Int'l flavor engine to clear the engine support crossmember. At least that's what the Int'l parts guy told me.
You should lay those two gaskets on top of each other and compare them that way.
You should lay those two gaskets on top of each other and compare them that way.