Which motor is in the 90? Which motor is in the 85?
The 85 should have either a 22R or a 22RE (fuel injected version). The 90 should have a 22RE or a 3VZE 3.0L V6.
If they both have 22RE 4-cylinder motors, the swap is fairly straight forward. If the 90 has a 22RE and the 85 has a 22R, the swap is still not terribly difficult, but you have to swap all of the engine controls, fuel injection components, and the fuel tank (not sure if the 90 one will swap in or not...)
If the 90 has a V6, I wouldn't bother.
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