I’m not sure. If there was just one pink reader involved then I’d say yes you would be. But there are two and they are both sited in the same zone (2/3). However, if you want to be certain to be charged the correct fare then travel the wrong way first and touch the pink reader at Willesden Junction before returning.
This is classed as a temporary or limited service route so changes to the normal fare tables are unlikely to be arranged.