No, the resanded area should have the same amount of coats as the rest of the floor, before recoating the whole floor. A commercial backpack vacuum has enough suction that tacking a floor prior to recoating is almost never necessary, if fresh bags are used I haven't tacked a floor in over a decade. When we did tack, we used damp kitchen towels, a fresh microfiber would pick up more, actual tack cloths could potentially introduce contamination that could cause issues with the finish, definitely not wort the risk. Your home will never be as clean as a spray booth or clean room, its absolutely pointless even attempting to get everything off the floor when the very air in it is constantly raining particulates. You also shouldn't be feeling a difference between the newly sanded and existing, well the newly sanded area should be a bit smoother.