They are both 2.3l lima engines so the same.
Car engines had different heads and cams, more HP and less torque for car cams
In '91 and '92 both should have "D" ports in heads
Oil pans will probably be different because of different under carriages.
Dip stick is for the oil pan used.
And oil capacity is for the oil pan used
Look here: Ford Ranger Fluids & Capacities
If you are using the truck oil pan then after adding 4 quarts, check level, then disable coils for a no start and crank engine a few times to fill filter and get some oil circulated.
Then check dip stick again