Does the SCV repair scale proportionally for time and resources?

This question suggests that repair speed varies from building to building, but what about multiple SCVs repairing the same building?

Assuming I have 2 Bunkers that have 50% life and 2 SCVs to repair them. Is there a time or resources difference between:

• 1st SCV repairs 1st Bunker and 2nd SCV repairs 2nd Bunker.
• Both SCVs repair 1st Bunker then 2nd Bunker.