intake manifolds are different, the '94 has EGR, the '96-up don't.

injectors are different, 94 are ~23lb/hr, 96-up are ~19lb/hr

ECU is different.

van front accessory drive is slightly different that a full size trucks, too.

that said, you should be able to take the newer motor and swap the older motor's intake/injectors on and you're good to go.

1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)