Wait a minute, so do you not have low beams now? Or were the halogens replaced with LED or HID bulbs and they hacked the harness side plugs off and spliced the power and ground leads directly to the harness?
What year is your car? If it's 2002-2004, the high beams and low beams both use H1, so yes, you can use any of those plugs interchangeably. If it's 2005-2006, the high beams were 9005 but the low beams were still H1. Either way, it looks like you have the correct plugs for the low beam shown in your picture there, so you're good to go if you use those.
Let me know about what's going on with that hack job. I'm just curious what they did to it. I'm actually in the process of doing a DIY article on how to make LED headlight bulbs plug-and-play with the factory harness.