Originally Posted by Fabrik8

That doesn't really sound like a bushing problem. That would have to be some incredibly bad binding to make the bushings compete with the spring rate and damping in order to make the tires hop. I'm guessing it's an alignment problem, or that the shocks aren't setup properly.
You've got two probably very different cars, and you're trying to blame the bushings. It could be the bushings, but there are so many other variables that have a much larger effect and are much more likely to be the problem. Different tires, different alignment, different damping, different wheels weights, different brakes, different ride height, different sway bars, different weight distribution, the list goes on and on. Shit, could even be differences in engine braking (and/or the engine mounts) if the engines aren't identical.

My point is that there is most likely a lot more differences between the setup and hardware of two cars than there are similarities, so I'm not sure what kind of conclusions you can actually draw about bushings. I'm still not saying you're wrong, just that you're probably making too big of a leap in logic.