Does the SCV repair scale proportionally for time and resources?

This [question](http://gaming.stackexchange.com/questions/16986/scv-repairing-speed) 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.