You filed 2 I-485 based on EB-1a and NIW, each I-485 is based -

You filed 2 I-485 based on EB-1a and NIW, each I-485 is based on its specific I-140. You may check the status of the other I-485.

You don't have to withdraw NIW I-140, but it's fine to do so if you prefer.