Yes, you can. You will pay and hire the gown/hood for one of your awards but may cross the stage twice depending on the order of proceedings and if both your awards belong to the same school/ceremony.
On the day, you will be given the gown/hood you have ordered after you check-in. The second hood will be given to you in the hall after you have crossed the stage for your first award. You will then cross the stage again a little later on, wearing the second hood. You will not need to pay for the second hood.
If you are unsure of anything, please contact the Graduation team.