They get the +1 for 2 CCW....
the extra +1 referenced is just for powerfists and the like that ONLY get the +1 for 2CCW when they are the same...
so wracks are 1 attack base, +1 for 2 CCW, and then +1 for charging as applicable
The Duke is 3 base, +1 for 2 CCW, +1 for charging as applicable
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