By comparing the M5 / M6, the two are very similar in terms of performance. They didn't have to differentiate performance too much simply because the M6 is more unique / different than the M5.
I'm guessing since the M3 / M4 will look similar, they'll differentiate a little in terms of standard features on the M4 vs the M3. Maybe wheels? I can't imagine BMW going out of their way in change the performance of the two cars. They already have the ZCP to think about.
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