what is the booking class? Forget partner seat maps ... you will go the partner website to select them anyway. As long as this shows business (P, Z, D, C, J) on united.com on the presumed NH flight ... you are good.
Make sure you don't want to book that on the NH site instead ... might earn more miles and PQP (depending on fare (class)). Lots of cheap fares ex-CKG that are not best booked on United