You need to check the input sensitivity/gain of the two amps. Odds are that they are the same but, if not, you will need to find a way to balance them.
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Wolf, the amount of power delivered to the tweeters will be determined by the high frequency content of the signal that goes into the amp, increased by the 26.8 db voltage gain of the amp. By "high frequency content" I mean the frequency components of the signal which are within the range of frequencies that the crossover network allows to be passed to the tweeters.
In the proposed biamp configuration the tweeters will see the same amount of power that they would see if the speakers were single-amp'd using that 200W amplifier, assuming equal volume levels in the two situations.