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Keep in mind that all the motors in a particular upgrade kit are the same (stage 1 26,000rpm, stage 2 30,000rpm) its the gear ratios that are making the difference. The 6 to 1 (white) gear ratio gives you better acceleration but less top speed. The 3.82 to 1 (blue) gear ratio gives you more top speed but the acceleration is not as good. The other two gear ratios fall somewhere in between. The best motor to use depends on the size, grip and type of track and your performance goals. Kyosho mini-z's come with several plastic pinion gears for the motor and spacers to allow you to change the gear ratio. Radio shack is doing essentially the same thing but with four of the same motors and four sets of gears. I am assuming Radio Shack took this approach because : a. the brass pinion can withstand the extra torque of the four wheel drive upgrade better than plastic, b. to make it easier for novices to understand gear ratios by color coding the motors and gears (similar to zip zaps), c. its just good marketing. or d. to make sure that the gears mesh properly.
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