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Based on my experienced of 5700 and 5600, it feels like there is a little more reach on the newer model, but it's hard to tell without actually measuring.
Even if the 6700 has a little more reach than your current setup, you could always position them a little higher that what yours are currently set as and then rotate the bars accordingly to give a nice flat top and (what should be) a shorter reach.
Good price! #FreeBump