GMDS, you said: "there is definitely a small roll input on the AB when decrabbing, which is not on a B.)"
It doesn't matter if it's a Boeing or an Airbus, ALL swept wing jet aircraft will have some additional roll moment induced upon "decrabbing" (input of downwind rudder). This is due to a reduction of "sweep" on the upwind wing in relation to the relative wind, thus an increase in lift on that upwind wing (as it 'swings' into the wind w/ a lesser angle), and the opposite affect upon the downwind wing- "more sweep" reduces lift on that one. Low, upwind wing required, at that point, to maintain runway track and actually landing on runway.