Unlikely, he was a practical man. Had he known that was Arya he would have taken her and immediately arranged a betrothal. He understood the value of having a northern stronghold and Arya was going to be the best next bargaining chip after Sansa to solidify that.

Maybe he was like Sally fields in Mrs Doubtfire, like sure they're someone else dressed up, but you don't take that shot unless your 100% certain you're right.