You've just discovered the not-so-elusive "Parts Droid" - a creature with less than two functional bran cells to rub together...
The basic 4.0 block has not changed since inception, so the gasket will work - just like the basic Chevvy Small Block is pretty much the same all the way up, with internal differences, the external stuff and basic parts will bolt to pretty much ANY SBChevvy.
While the internal specifications of some 4.0 parts changed, the valve cover gasket, oil sump gasket, front covers, timing sets, heads, and suchlike can all be swapped. Even if there are internal changes (which may or may not be good for you - depends on what you are trying to do) the essential dimensions of everything is still the same.
Get the one-piece gasket. I've not used one, but the reports from here are outstanding.
5-90