The '90-'93 oil pan gaskets had a few different design changes, there was a problem on the rear oil pan seal, often mistaken for a rear main seal leak.
So yes, there would probably be a difference in the '94 gasket, yet another "improvement"
When you had the oil pan out did you place it face down on a flat surface, to make sure it wasn't warped?
Oil pan, like valve cover, gaskets are no pressure gaskets, so are soft seals.
I know on some models Ford gooped silicone on them to get a good seal, this often cause oil pump issues as the beads of hardened silicone would drop off inside the pan and clogged the pickup screen.
So don't be afraid to use silicone sealer, Ford had too, but use it on the outside edge of the gasket or sparingly.
The crankcase(oil pan) and valve cover area does have some pressure when engine is running, this is cause by Blow-by.
Blow-by is the pressure that manages to pass by the rings on the piston each time a cylinder fires, this is expected and normal, but as an engine gets more miles the blow-by increases, also normal, but pressure in crankcase and valve cover also increases.
The PCV valve and Vent hose(from valve cover to air intake/plenum) are there to keep this pressure low, if these hoses are restricted it pretty much forces an oil leak from a soft seal gasket, and once the leak starts reducing the pressure doesn't help much, the hole is there, gasket must be repaired.
You can test how much blow-by pressure you have by removing dip stick while engine is running, feel the pressure coming out of the dip stick tube, rev engine while feeling the pressure, should go up a bit but not alot.
You can test it at the oil filler cap as well, just make sure oil isn't splashing out
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