Send new survey to seperate contacts

I have a survey project scheduled to go to 6,000 contacts. When I did a soft launch to just 200, however, an error was discovered! Thank goodness for little tests.

I need to create a whole new survey project to send to the remaining contacts. I don't want to bother the initial 200 with a second survey, however. Does anyone know an expedient way to identify the "non-soft launch" people?

I can't think of anything sort of exporing them all and cross referencing my soft-launch sample, and then re-uploading them. Which feels really cumbersome! I could be wrong but it really feels like there should be a faster way to do this...