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Well, 4 drills would make swerve drive a whole lot easier; perhaps too easy. If you have 4 identical motors, like the drills, you could just put one on each wheel, and not have to worry about matching speeds between two dissimilar motors.
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Actually almost all designs can get through with using just a pair of similar motors for drive. You would just need another motor for steering.
Ackerman-Don't need a pair but it will improve power if you do use two of them for drivetrain.
Differntial-It will work with just a pair of drill motors.
Synchro Drive or Crab Steering-I have thought about it. You probably could make do with just two drill motors and have the others just free wheel.
The only one where you need more than two motors is the holonic or omni wheel deising.